Overview of the Cactaceae Family
The Cactaceae family, commonly known as the cactus family, is a diverse group of plants that are native to the Americas. This family comprises over 1,750 species of succulent plants, mostly found in arid regions, although some occur in humid environments. They are highly adapted to living in water-limited environments, sending deep roots in search of water. The family is divided into four subfamilies and about 140 genera.
Taxonomic Details
The Cactaceae family belongs to the order Caryophyllales, which also includes the amaranth and carnation families. The family is further divided into four subfamilies, namely, Cactoideae, Maihuenioideae, Opuntioideae, and Pereskioideae. The subfamily Cactoideae is the most diverse, containing about 130 genera and over 1,500 species. The Pereskioideae subfamily is the most distinct, with only one genus, Pereskia.
Unique Characteristics
Cacti are unique plants with distinctive features that set them apart from other families. One such feature is their succulent stems, which are capable of storing water for long periods. This adaptation enables cacti to survive in habitats where water is scarce. Additionally, cacti have spines, thorns, or hairs that serve to protect them against predators and reduce water loss through transpiration. Furthermore, cacti have unique flowers that are usually large and showy, attracting pollinators such as bees and birds.
In conclusion, the Cactaceae family is a fascinating and specialized group of plants that have adapted to challenging environments. Their unique features make them easy to identify and are a testament to the diversity of plants in the natural world.
Distribution of the Cactaceae family
The Cactaceae family is primarily found in the Americas, with the highest diversity occurring in Mexico and South America. Species from this family are also found in the southwestern United States and several Caribbean islands.
Habitats of the Cactaceae family
Plants from the Cactaceae family can be found in a variety of natural habitats, including deserts, grasslands, and tropical forests. Within these habitats, cacti tend to grow in areas with well-draining soil and receive adequate amounts of sunlight. Some species may also be found in rocky or hilly terrains.
Ecological preferences and adaptations of the Cactaceae family
The Cactaceae family is well adapted to survive in harsh desert environments. Cacti have evolved a variety of adaptations to withstand extreme temperatures, limited water availability, and intense sunlight. For example, cacti have thickened stems that store water, allowing them to survive for long periods without rainfall. They also have shallow but expansive root systems that allow them to absorb nutrients and water quickly during brief rain events.
Cacti have also adapted unique mechanisms for minimizing water loss through transpiration. For instance, some species have evolved a special type of photosynthesis called Crassulacean Acid Metabolism (CAM), which allows them to open their stomata at night to collect carbon dioxide and store it in organic acids. During the day, when the stomata are closed to prevent water loss, the acids are used to fuel photosynthesis. Other species have developed spiny or hairy stems that help to shade the plant's surface area and reduce water loss through evaporation.
General morphology and structure of Cactaceae plants
Cactaceae is a family of flowering plants commonly known as cacti. They are known for their succulent nature and distinct morphology that has evolved to allow them to survive in harsh desert environments. Cacti have a unique anatomical structure that is modified to minimize water loss and maximize water storage. The stem has evolved to perform the functions of leaves, while the leaves have diminished over time to spines.
Anatomical features and adaptations
One of the main adaptations of cacti is their thick, water-storing stems. Their stems also have a waxy cuticle layer, which reduces water loss through transpiration. The reduction of leaves and the presence of spines are other important adaptations to conserve water. Additionally, cacti have deep root systems that help them absorb water efficiently from the soil. Furthermore, some cacti have shallow roots that spread out widely to capture moisture from rain.
Variations in leaf shapes and flower structures
The majority of cacti have no visible leaves, but some might have small, flattened leaves, which are known as cladodes. Others, such as the Pereskia species, have large and recognizable leaves. Cacti flowers are generally large and colorful, but their shapes can vary greatly. Some cacti, like the saguaro, have large flowers with numerous stamens and a single stigma. Other cacti, such as the barrel cactus, have smaller, cup-shaped flowers with few stamens and a single stigma. Flowers of some cacti, such as night-blooming cereus, bloom only for a few hours at night and emit a strong fragrance to attract nocturnal pollinators.
In conclusion, the overall morphology of Cactaceae family members is prominently shaped by their adaptation to harsh desert environments. Cacti have a reduced number of leaves that are often modified as spines, with thick, succulent, and waxy stems that store water and minimize water loss. Additionally, the family members have deep root systems with shallow extensions that aid in efficient water absorption. Lastly, while the majority of Cactaceae flowers have large and brightly colored petals, their shapes can be diverse among the family members.
Reproductive strategies in the Cactaceae family
Plants in the Cactaceae family employ various reproductive strategies to ensure the survival and proliferation of their species in harsh desert environments. These strategies include both sexual and asexual reproduction.
Sexual reproduction
Cacti produce flowers, which are typically large, showy and brightly colored. The flowers are usually hermaphroditic, containing both male and female reproductive organs. Some species of Cactaceae, such as the genus Echinocereus, produce separate male and female flowers.
The flowers of the Cactaceae family bloom in response to specific environmental cues, such as rainfall or temperature changes. Many species of Cactaceae bloom at night and rely on nocturnal pollinators, such as bats, moths, and bees.
Pollinators are attracted to the brightly colored flowers, and in the process of visiting the flower, they transfer pollen from the male reproductive organs (stamens) to the female reproductive organs (pistils). Once the pollen reaches the pistil, it fertilizes the ovules, which develop into seeds.
Asexual reproduction
In addition to sexual reproduction, many species of Cactaceae also employ asexual reproduction. Some species can reproduce vegetatively from stem segments or offsets, which are small plantlets that grow from the parent plant.
Additionally, some species of Cactaceae can reproduce from detached stem fragments, which can sprout roots and develop into new plants. This method of asexual reproduction is especially useful in environments with low water availability, as it allows the plant to reproduce without relying on seeds.
Seed dispersal and adaptations
Once the seeds have formed, cacti use various methods to disperse them. Some species of Cactaceae, such as the saguaro cactus (Carnegiea gigantea), rely on birds to disperse their seeds. The saguaro produces fruit that is eaten by birds, which then disperse the seeds in their droppings.
Other species of Cactaceae, such as the prickly pear cactus (Opuntia spp.), have specialized adaptations for seed dispersal. The prickly pear produces fruits that are covered in small spines. These spines attach to the fur of animals that come into contact with the fruit, which then carry the fruit away and disperse the seeds.
Economic and Ecological Importance of the Cactaceae Family
The Cactaceae family, commonly known as cacti, is one of the most diverse and recognizable plant families in the world. These plants have economic, ecological, and cultural importance and are found in almost every continent, excluding Antarctica.
Economic Value
Cacti have enormous economic value due to their medicinal, culinary, and industrial uses. The most well-known medicinal use of cacti is in the production of peyote, which is a psychoactive drug. Peyote has been used for centuries by Native American communities for religious and healing ceremonies. In addition to its spiritual significance, peyote is also used to treat various illnesses such as arthritis and rheumatism.
Cacti also have culinary value, particularly in arid regions where food is scarce. The prickly pear cactus, for example, produces edible fruit and pads that are widely used in Mexican and Southwestern cuisine. Additionally, the fruit and seed oil of the saguaro cactus are utilized in food and cosmetic products.
The industrial uses of cacti are just as diverse. The fibers of certain cactus species are used in several textiles, while the sap of the giant cactus, Carnegiea gigantea, can be fermented to produce an alcoholic beverage.
Ecological Role and Interactions
The ecological role of cacti is crucial in maintaining ecosystem functioning in arid regions worldwide. Cacti are well adapted to survive in dry and harsh environments, and their presence supports biodiversity by providing habitat and food for a wide range of organisms, including insects, rodents, and rabbits. Additionally, cacti play a role in soil retention and erosion control by stabilizing soil with their deep roots. The reduction of cacti populations impacts the survival of above and below-ground fauna, altering ecosystem dynamics and negatively affecting associated ecological roles.
Conservation Status and Ongoing Efforts
The Cactaceae family is under threat mainly due to habitat loss, overexploitation, and climate change. As a result, many species are listed as endangered, vulnerable, or threatened on the IUCN Red List. To help tackle this, several conservation initiatives and laws are in place to protect cacti. For instance, the saguaro cactus is protected under the U.S. Endangered Species Act. Further, some botanical gardens and protected areas have established conservation programs and captive breeding to conserve endangered cactus species.
In conclusion, the Cactaceae family has tremendous economic and ecological significance and is crucial to the survival of biodiversity in arid regions. As such, it is important to implement conservation measures to mitigate the impacts of anthropogenic activities and climate change on this family of valuable and unique plants.
Featured plants from the Cactaceae family
More plants from the Cactaceae family
- Acanthocereus (Engelm. ex Berger) Britt. & Rose - Triangle Cactus
- Acanthocereus floridanus Small - >>acanthocereus Tetragonus
- Acanthocereus pentagonus (L.) Britt. & Rose - >>acanthocereus Tetragonus
- Acanthocereus tetragonus (L.) Humm. - Triangle Cactus
- Ancistrocactus scheeri (Salm-Dyck) Britt. & Rose - >>sclerocactus Scheeri
- Ancistrocactus tobuschii (W.T. Marsh.) W.T. Marsh. ex Backeberg - >>sclerocactus Brevihamatus Ssp. Tobuschii
- Ancistrocactus uncinatus (Galeottii) L. Benson var. wrightii (Engelm.) L. Benson - >>sclerocactus Uncinatus Var. Wrightii
- Ariocarpus fissuratus (Engelm.) K. Schum. - Chautle Livingrock
- Ariocarpus Scheidw. - Livingrock
- Astrophytum asterias (Zucc.) Lem. - Sanddollar
- Astrophytum Lem. - Astrophytum
- Astrophytum myriostigma Lem.
- Bergerocactus Britt. & Rose - Snakecactus
- Bergerocactus emoryi (Engelm.) Engelm. - Golden Snakecactus
- Bergerocereus emoryi (Engelm.) Britt. & Rose - >>bergerocactus Emoryi
- Borzicactus icosagonus (Kunth) Britton & Rose - >>cleistocactus Icosagonus
- Borzicactus Riccob. - Borzicactus
- Brasiliopuntia brasiliensis (Willd.) Haw. - >>opuntia Brasiliensis
- Cactus brasiliensis Willd. - >>opuntia Brasiliensis
- Cactus cochenillifer L.
- Cactus cochenilliferus L. - >>opuntia Cochenillifera
- Cactus dillenii Ker Gawl.
- Cactus dillenii Ker-Gawl. - >>opuntia Stricta Var. Dillenii
- Cactus ficus-indica L. - >>opuntia Ficus-indica
- Cactus ficus-indica L.
- Cactus fragilis Nutt. - >>opuntia Fragilis Var. Fragilis
- Cactus intortus P. Mill. - >>melocactus Intortus
- Cactus microdasys Lehm.
- Cactus opuntia L.
- Cactus pereskia L. - >>pereskia Aculeata
- Cactus pereskia L.
- Cactus peruvianus L.
- Cactus pusillus Haw. - >>opuntia Pusilla
- Cactus robustispinus (Schott ex Engelm.) Kuntze - >>coryphantha Scheeri Var. Robustispina
- Cactus spinosissimus (P. Mill.) Martyn - >>opuntia Spinosissima
- Cactus strictus Haw. - >>opuntia Stricta Var. Stricta
- Cactus strictus Haw.
- Cactus triacanthus Willd. - >>opuntia Triacantha
- Cactus triangularis L.
- Cactus tuna L.
- Carnegia Britt. & Rose - Saguaro
- Carnegia gigantea (Engelm.) Britt. & Rose - Saguaro
- Carnegiea Britton & Rose - Saguaro
- Carnegiea gigantea (Engelm.) Britton & Rose - Saguaro
- Cassytha baccifera Soland. ex J. Mill. - >>rhipsalis Baccifera
- Cephalocereus deeringii Small - >>pilosocereus Robinii Var. Deeringii
- Cephalocereus keyensis Britt. & Rose - >>pilosocereus Robinii Var. Robinii
- Cephalocereus nobilis (Haw.) Britt. & Rose - >>pilosocereus Royenii
- Cephalocereus Pfeiff. - Cephalocereus
- Cephalocereus royenii (L.) Britt. & Rose - >>pilosocereus Royenii
- Cereus blankii Poselg. - >>echinocereus Berlandieri
- Cereus coniflorus Weingart - >>selenicereus Coniflorus
- Cereus diguetii A. Weber - >>peniocereus Striatus
- Cereus emoryi Engelm. - >>bergerocactus Emoryi
- Cereus eriophorus N.E. Pfeiffer & Otto var. fragrans (Small) L. Benson - >>harrisia Fragrans
- Cereus giganteus Engelm. - >>carnegia Gigantea
- Cereus gracilis P. Mill. var. aboriginus (Small) L. Benson - >>harrisia Aboriginum
- Cereus gracilis P. Mill. var. simpsonii (Small) L. Benson - >>harrisia Simpsonii
- Cereus grandiflorus (L.) P. Mill. - >>selenicereus Grandiflorus
- Cereus grandiflorus (L.) P. Mill. var. armatus (K. Schum.) L. Benson - >>selenicereus Coniflorus
- Cereus grantianus (Britt.) Kelsey & Dayton - >>leptocereus Grantianus
- Cereus greggii Engelm. - >>peniocereus Greggii Var. Greggii
- Cereus greggii Engelm. var. transmontanus Engelm. - >>peniocereus Greggii Var. Transmontanus
- Cereus hexagonus (L.) P. Mill. - Lady Of The Night Cactus
- Cereus hildmannianus K. Schum. - Hedge Cactus
- Cereus hystrix (Haw.) P. Mill. - >>stenocereus Fimbriatus
- Cereus imbricatus Haw. - >>opuntia Imbricata Var. Imbricata
- Cereus imbricatus Haw.
- Cereus jamacaru DC.
- Cereus martinii Labour.
- Cereus martinii Labouret - >>harrisia Martinii
- Cereus P. Mill. - Sweetpotato Cactus
- Cereus pectinatus (Scheidw.) Engelm. var. rigidissimus Engelm. - >>echinocereus Rigidissimus
- Cereus pentagonus (L.) Haw. - >>acanthocereus Tetragonus
- Cereus peruvianus (L.) Mill.
- Cereus peruvianus auct. non (L.) P. Mill. - >>cereus Hildmannianus
- Cereus portoricensis (Britt.) Urban - >>harrisia Portoricensis
- Cereus poselgeri (Lem.) Coult. - >>echinocereus Poselgeri
- Cereus pteranthus Link ex A. Dietr. - >>selenicereus Pteranthus
- Cereus quadricostatus Bello - >>leptocereus Quadricostatus
- Cereus robinii (Lem.) L. Benson - >>pilosocereus Robinii Var. Robinii
- Cereus robinii (Lem.) L. Benson var. deeringii (Small) L. Benson - >>pilosocereus Robinii Var. Deeringii
- Cereus robinii (Lem.) L. Benson var. keyensis (Britt. & Rose) L. Benson ex Long & Lakela - >>pilosocereus Robinii Var. Robinii
- Cereus royenii (L.) P. Mill. - >>pilosocereus Royenii
- Cereus schottii Engelm. - >>pachycereus Schottii
- Cereus spachianus Lem.
- Cereus spinulosus DC. - >>selenicereus Spinulosus
- Cereus striatus Brandeg. - >>peniocereus Striatus
- Cereus strictus DC. - >>pilosocereus Royenii
- Cereus thurberi Engelm. - >>stenocereus Thurberi
- Cereus trigonus Haw. - >>hylocereus Trigonus
- Cereus tuberosus Poselg. - >>echinocereus Poselgeri
- Cereus undatus Haw. - >>hylocereus Undatus
- Cereus undatus Haw.
- Cereus uruguayanus Kiesling - >>cereus Hildmannianus
- Cereus viridiflorus (Engelm.) Engelm. var. cylindricus Engelm. - >>echinocereus Viridiflorus Var. Cylindricus
- Cleistocactus icosagonus (Kunth) F.A.C. Weber
- Cleistocactus Lem. - Cleistocactus
- Cochiseia robbinsiorum W.H. Earle - >>escobaria Robbinsiorum
- Coloradoa mesae-verdae Boissevain ex Boissevain & C. Davids. - >>sclerocactus Mesae-verdae
- Consolea corallicola Small - >>opuntia Spinosissima
- Consolea moniliformis (L.) Britt. - >>opuntia Moniliformis
- Consolea rubescens (Salm-Dyck ex DC.) Lem. - >>opuntia Rubescens
- Corryocactus Britton & Rose - Corryocactus
- Coryphantha (Engelm.) Lem. - Beehive Cactus
- Coryphantha albicolumnaria (Hester) A.D. Zimmerman - >>escobaria Albicolumnaria
- Coryphantha alversonii (Coult.) Orcutt - >>escobaria Alversonii
- Coryphantha arizonica (Engelm.) Britt. & Rose - >>escobaria Vivipara Var. Arizonica
- Coryphantha bisbeeana Orcutt - >>escobaria Vivipara Var. Bisbeeana
- Coryphantha chaffeyi (Britt. & Rose) Fosberg - >>escobaria Dasyacantha Var. Chaffeyi
- Coryphantha cornifera (DC.) Lem. var. echinus (Engelm.) L. Benson - >>coryphantha Echinus
- Coryphantha dasyacantha (Engelm.) Orcutt - >>escobaria Dasyacantha Var. Dasyacantha
- Coryphantha dasyacantha (Engelm.) Orcutt var. varicolor (Tiegel) L. Benson - >>escobaria Tuberculosa
- Coryphantha deserti (Engelm.) Britt. & Rose - >>escobaria Vivipara Var. Deserti
- Coryphantha duncanii (Hester) L. Benson - >>escobaria Dasyacantha Var. Duncanii
- Coryphantha echinus (Engelm.) Britt. & Rose - Rhinoceros Cactus
- Coryphantha fragrans Hester - >>escobaria Vivipara Var. Radiosa
- Coryphantha hesteri Y. Wright - >>escobaria Hesteri
- Coryphantha macromeris (Engelm.) Lem. - Nipple Beehive Cactus
- Coryphantha macromeris (Engelm.) Lem. var. macromeris - Nipple Beehive Cactus
- Coryphantha macromeris (Engelm.) Lem. var. runyonii (Britt. & Rose) L. Benson - Runyon's Beehive Cactus
- Coryphantha minima Baird - >>escobaria Minima
- Coryphantha missouriensis (Sweet) Britt. & Rose - >>escobaria Missouriensis Var. Missouriensis
- Coryphantha missouriensis (Sweet) Britt. & Rose var. caespitosa (Engelm.) L. Benson - >>escobaria Missouriensis Var. Similis
- Coryphantha missouriensis (Sweet) Britt. & Rose var. marstonii (Clover) L. Benson - >>escobaria Missouriensis Var. Marstonii
- Coryphantha missouriensis (Sweet) Britt. & Rose var. robustior (Engelm.) L. Benson - >>escobaria Missouriensis Var. Robustior
- Coryphantha nellieae Croizat - >>escobaria Minima
- Coryphantha neomexicana (Engelm.) Britt. & Rose - >>escobaria Vivipara Var. Neomexicana
- Coryphantha nickelsiae (K. Brandeg.) Britt. & Rose - Nickels' Cactus
- Coryphantha organensis A.D. Zimmerman - >>escobaria Organensis
- Coryphantha pectinata (Engelm.) Britt. & Rose - >>coryphantha Echinus
- Coryphantha radiosa (Engelm.) Rydb. - >>escobaria Vivipara Var. Radiosa
- Coryphantha ramillosa Cutak - Whiskerbush
- Coryphantha recurvata (Engelm.) Britt. & Rose - Santa Cruz Beehive Cactus
- Coryphantha robbinsiorum (W.H. Earle) A.D. Zimmerman - >>escobaria Robbinsiorum
- Coryphantha robertii Berger - >>escobaria Emskoetteriana
- Coryphantha robustispina (Schott ex Engelm.) Britt. & Rose - >>coryphantha Scheeri Var. Robustispina
- Coryphantha runyonii Britt. & Rose - >>coryphantha Macromeris Var. Runyonii
- Coryphantha scheeri (Muehlenpfordt) L. Benson - Scheer's Beehive Cactus
- Coryphantha scheeri (Muehlenpfordt) L. Benson var. robustispina (Schott ex Engelm.) L. Benson - Longtubercle Beehive Cactus
- Coryphantha scheeri (Muehlenpfordt) L. Benson var. scheeri - Scheer's Beehive Cactus
- Coryphantha scheeri (Muehlenpfordt) L. Benson var. uncinata L. Benson - Scheer's Beehive Cactus
- Coryphantha scheeri (Muehlenpfordt) L. Benson var. valida (Engelm.) L. Benson - Scheer's Beehive Cactus
- Coryphantha similis (Engelm.) Britt. & Rose - >>escobaria Missouriensis Var. Similis
- Coryphantha sneedii (Britt. & Rose) Berger - >>escobaria Sneedii Var. Sneedii
- Coryphantha sneedii (Britt. & Rose) Berger var. leei (Rose ex Bödecker) L. Benson - >>escobaria Sneedii Var. Leei
- Coryphantha strobiliformis (Poselg.) Moran var. durispina (Quehl) L. Benson - >>escobaria Orcuttii
- Coryphantha strobiliformis (Poselg.) Moran var. orcuttii (Bödecker) L. Benson - >>escobaria Orcuttii
- Coryphantha strobiliformis auct. non (Poselg.) Orcutt - >>escobaria Tuberculosa
- Coryphantha sulcata (Engelm.) Britt. & Rose - Pineapple Cactus
- Coryphantha sulcata (Engelm.) Britt. & Rose var. nickelsiae (K. Brandeg.) L. Benson - >>coryphantha Nickelsiae
- Coryphantha vivipara (Nutt.) Britt. & Rose - >>escobaria Vivipara Var. Vivipara
- Coryphantha vivipara (Nutt.) Britt. & Rose var. aggregata (Engelm.) W.T. Marsh. - >>echinocereus Coccineus Var. Coccineus
- Coryphantha vivipara (Nutt.) Britt. & Rose var. alversonii (Coult.) L. Benson - >>escobaria Alversonii
- Coryphantha vivipara (Nutt.) Britt. & Rose var. arizonica (Engelm.) W.T. Marsh. - >>escobaria Vivipara Var. Arizonica
- Coryphantha vivipara (Nutt.) Britt. & Rose var. bisbeeana (Orcutt) L. Benson - >>escobaria Vivipara Var. Bisbeeana
- Coryphantha vivipara (Nutt.) Britt. & Rose var. buoflama P.C. Fischer - >>escobaria Vivipara Var. Buoflama
- Coryphantha vivipara (Nutt.) Britt. & Rose var. deserti (Engelm.) W.T. Marsh. - >>escobaria Vivipara Var. Deserti
- Coryphantha vivipara (Nutt.) Britt. & Rose var. kaibabensis P.C. Fischer - >>escobaria Vivipara Var. Kaibabensis
- Coryphantha vivipara (Nutt.) Britt. & Rose var. neomexicana (Engelm.) Backeberg - >>escobaria Vivipara Var. Neomexicana
- Coryphantha vivipara (Nutt.) Britt. & Rose var. radiosa (Engelm.) Backeberg - >>escobaria Vivipara Var. Radiosa
- Coryphantha vivipara (Nutt.) Britt. & Rose var. rosea (Clokey) L. Benson - >>escobaria Vivipara Var. Rosea
- Cylindropuntia imbricata (Haw.) F.M. Knuth - >>opuntia Imbricata Var. Imbricata
- Cylindropuntia whipplei (Engelm. & Bigelow) F.M. Knuth - >>opuntia Whipplei
- Cylindropuntia ×munzii (C.B. Wolf) Backeberg - >>opuntia Munzii
- Dolichothele sphaerica (A. Dietr.) Britt. & Rose - >>mammillaria Sphaerica
- Eccremocactus bradei Britton & Rose
- Eccremocactus Britton & Rose - Eccremocactus
- Echinocactus acanthodes Lem. - >>ferocactus Cylindraceus Var. Cylindraceus
- Echinocactus asterias Zucc. - >>astrophytum Asterias
- Echinocactus bicolor Galeotti ex Pfeiffer - >>thelocactus Bicolor Var. Bicolor
- Echinocactus bicolor Galeotti ex Pfeiffer var. schottii Engelm. - >>thelocactus Bicolor Var. Bicolor
- Echinocactus conoideus (DC.) Poselg. - >>neolloydia Conoidea
- Echinocactus erectocentrus Coult. - >>sclerocactus Erectocentrus
- Echinocactus flavidispinus (Backeberg) Weniger - >>thelocactus Bicolor Var. Flavidispinus
- Echinocactus glaucus (J.A. Purpus ex K. Schum.) L. Benson - >>sclerocactus Glaucus
- Echinocactus hamatacanthus Muehlenpfordt - >>ferocactus Hamatacanthus Var. Hamatacanthus
- Echinocactus horizonthalonius Lem. - Devilshead
- Echinocactus horizonthalonius Lem. var. horizonthalonius - Devilshead
- Echinocactus horizonthalonius Lem. var. moelleri Haage f. - >>echinocactus Horizonthalonius Var. Horizonthalonius
- Echinocactus horizonthalonius Lem. var. nicholii L. Benson - Nichol's Echinocactus
- Echinocactus intertextus Engelm. - >>sclerocactus Intertextus Var. Intertextus
- Echinocactus intertextus Engelm. var. dasyacanthus Engelm. - >>sclerocactus Intertextus Var. Dasyacanthus
- Echinocactus johnsonii Parry ex Engelm. - >>sclerocactus Johnsonii
- Echinocactus johnsonii Parry ex Engelm. var. lutescens Parish - >>sclerocactus Johnsonii
- Echinocactus lecontei Engelm. - >>ferocactus Cylindraceus Var. Lecontei
- Echinocactus Link & Otto - Echinocactus
- Echinocactus mariposensis (Hester) Weniger - >>sclerocactus Mariposensis
- Echinocactus mesae-verdae (Boissevain ex Boissevain & C. Davids.) L. Benson - >>sclerocactus Mesae-verdae
- Echinocactus papyracanthus Engelm. - >>sclerocactus Papyracanthus
- Echinocactus polyancistrus Engelm. & Bigelow - >>sclerocactus Polyancistrus
- Echinocactus polycephalus Engelm. & Bigelow - Cottontop Cactus
- Echinocactus polycephalus Engelm. & Bigelow var. polycephalus - Cottontop Cactus
- Echinocactus polycephalus Engelm. & Bigelow var. xeranthemoides Coult. - Cottontop Cactus
- Echinocactus scheeri Salm-Dyck - >>sclerocactus Scheeri
- Echinocactus setispinus Engelm. - >>thelocactus Setispinus
- Echinocactus setispinus Engelm. var. hamatus (Muehlenpfordt) Engelm. - >>thelocactus Setispinus
- Echinocactus simpsonii Engelm. - >>pediocactus Simpsonii Var. Simpsonii
- Echinocactus simpsonii Engelm. var. robustior Coult. - >>pediocactus Simpsonii Var. Robustior
- Echinocactus sinuatus A. Dietr. - >>ferocactus Hamatacanthus Var. Sinuatus
- Echinocactus texensis Hopffer - Horse Crippler
- Echinocactus tobuschii (W.T. Marsh.) Weniger - >>sclerocactus Brevihamatus Ssp. Tobuschii
- Echinocactus uncinatus Galeotti var. wrightii Engelm. - >>sclerocactus Uncinatus Var. Wrightii
- Echinocactus viridescens Torr. & Gray - >>ferocactus Viridescens
- Echinocactus warnockii (L. Benson) Weniger - >>sclerocactus Warnockii
- Echinocactus whipplei Engelm. & Bigelow - >>sclerocactus Whipplei
- Echinocactus whipplei Engelm. & Bigelow var. intermedius (Peebles) L. Benson - >>sclerocactus Parviflorus Ssp. Intermedius
- Echinocactus whipplei Engelm. & Bigelow var. spinosior Engelm. - >>sclerocactus Spinosior
- Echinocactus wislizeni Engelm. - >>ferocactus Wislizeni
- Echinocactus xeranthemoides (Coult.) Engelm. ex Rydb. - >>echinocactus Polycephalus Var. Xeranthemoides
- Echinocereus abbeae S.H. Parsons - >>echinocereus Fendleri Var. Fasciculatus
- Echinocereus albispinus Lahman - >>echinocereus Reichenbachii Var. Baileyi
- Echinocereus angusticeps Clover - >>echinocereus Papillosus Var. Angusticeps
- Echinocereus baileyi Rose - >>echinocereus Reichenbachii Var. Baileyi
- Echinocereus baileyi Rose var. albispinus (Lahman) Backeberg - >>echinocereus Reichenbachii Var. Baileyi
- Echinocereus berlandieri (Engelm.) Haage f. - Berlandier's Hedgehog Cactus
- Echinocereus berlandieri (Engelm.) Haage f. var. angusticeps (Clover) L. Benson - >>echinocereus Papillosus Var. Angusticeps
- Echinocereus berlandieri (Engelm.) Haage f. var. blankii (Poselg.) Fourn. - >>echinocereus Berlandieri
- Echinocereus berlandieri (Engelm.) Haage f. var. papillosus (Linke ex Rumpl.) L. Benson - >>echinocereus Papillosus Var. Papillosus
- Echinocereus blankii (Poselg.) hort. ex Palmer - >>echinocereus Berlandieri
- Echinocereus blankii (Poselg.) Poselg. ex Rumpl. var. angusticeps (Clover) L. Benson - >>echinocereus Papillosus Var. Angusticeps
- Echinocereus bonkerae Thornb. & Bonker - >>echinocereus Fendleri Var. Bonkerae
- Echinocereus boyce-thompsonii Orcutt - >>echinocereus Fendleri Var. Boyce-thompsonii
- Echinocereus bristolii W.T. Marsh. var. pseudopectinatus N.P. Taylor - >>echinocereus Pseudopectinatus
- Echinocereus caespitosus (Engelm.) Engelm. - >>echinocereus Reichenbachii Var. Reichenbachii
- Echinocereus caespitosus (Engelm.) Engelm. var. minor Engelm. - >>echinocereus Reichenbachii Var. Reichenbachii
- Echinocereus caespitosus (Engelm.) Engelm. var. perbellus (Britt. & Rose) Weniger - >>echinocereus Reichenbachii Var. Perbellus
- Echinocereus caespitosus (Engelm.) Engelm. var. purpureus Weniger - >>echinocereus Reichenbachii Var. Reichenbachii
- Echinocereus chisoensis W.T. Marsh. - Chisos Mountain Hedgehog Cactus
- Echinocereus chloranthus (Engelm.) Haage f. - >>echinocereus Viridiflorus Var. Cylindricus
- Echinocereus chloranthus (Engelm.) Haage f. var. cylindricus (Engelm.) N.P. Taylor - >>echinocereus Viridiflorus Var. Cylindricus
- Echinocereus chloranthus (Engelm.) Haage f. var. neocapillus Weniger - >>echinocereus Viridiflorus Var. Cylindricus
- Echinocereus chloranthus (Engelm.) Haage f. var. russanthus (Weniger) Lamb. ex Rowley - >>echinocereus Russanthus
- Echinocereus coccineus Engelm. - Scarlet Hedgehog Cactus
- Echinocereus coccineus Engelm. var. arizonicus (Rose ex Orcutt) Ferguson - Arizona Hedgehog Cactus
- Echinocereus coccineus Engelm. var. coccineus - Scarlet Hedgehog Cactus
- Echinocereus coccineus Engelm. var. conoideus (Engelm.) Weniger - >>echinocereus Coccineus Var. Coccineus
- Echinocereus coccineus Engelm. var. gurneyi (L. Benson) Heil & Brack - Gurney's Hedgehog Cactus
- Echinocereus coccineus Engelm. var. inermis (K. Schum.) J.A. Purpus - >>echinocereus Coccineus Var. Coccineus
- Echinocereus coccineus Engelm. var. paucispinus (Engelm.) Ferguson - Scarlet Hedgehog Cactus
- Echinocereus ctenoides (Engelm.) Lem. - >>echinocereus Dasyacanthus
- Echinocereus dasyacanthus Engelm. - Spiny Hedgehog Cactus
- Echinocereus dasyacanthus Engelm. var. hildmannii (Arendt) Weniger - >>echinocereus Dasyacanthus
- Echinocereus davisii A.D. Houghton - >>echinocereus Viridiflorus Var. Davisii
- Echinocereus dubius (Engelm.) Engelm. ex Rumpl. - >>echinocereus Enneacanthus Var. Enneacanthus
- Echinocereus Engelm. - Hedgehog Cactus
- Echinocereus engelmannii (Parry ex Engelm.) Lem. - Engelmann's Hedgehog Cactus
- Echinocereus engelmannii (Parry ex Engelm.) Lem. var. acicularis L. Benson - Engelmann's Hedgehog Cactus
- Echinocereus engelmannii (Parry ex Engelm.) Lem. var. armatus L. Benson - Engelmann's Hedgehog Cactus
- Echinocereus engelmannii (Parry ex Engelm.) Lem. var. chrysocentrus (Engelm. & Bigelow) Rumpl. - Engelmann's Hedgehog Cactus
- Echinocereus engelmannii (Parry ex Engelm.) Lem. var. engelmannii - Engelmann's Hedgehog Cactus
- Echinocereus engelmannii (Parry ex Engelm.) Lem. var. howei L. Benson - Howe's Hedgehog Cactus
- Echinocereus engelmannii (Parry ex Engelm.) Lem. var. munzii (Parish) Pierce & Fosberg - Munz's Hedgehog Cactus
- Echinocereus engelmannii (Parry ex Engelm.) Lem. var. nicholii L. Benson - >>echinocereus Nicholii
- Echinocereus engelmannii (Parry ex Engelm.) Lem. var. purpureus L. Benson - Engelmann's Hedgehog Cactus
- Echinocereus engelmannii (Parry ex Engelm.) Lem. var. variegatus (Engelm. & Bigelow) Rumpl. - Engelmann's Hedgehog Cactus
- Echinocereus enneacanthus Engelm. - Pitaya
- Echinocereus enneacanthus Engelm. var. brevispinus (W.O. Moore) L. Benson - Pitaya
- Echinocereus enneacanthus Engelm. var. carnosus (Rumpl.) Quehl - >>echinocereus Enneacanthus Var. Brevispinus
- Echinocereus enneacanthus Engelm. var. dubius (Engelm.) L. Benson - >>echinocereus Enneacanthus Var. Enneacanthus
- Echinocereus enneacanthus Engelm. var. enneacanthus - Pitaya
- Echinocereus enneacanthus Engelm. var. stramineus (Engelm.) L. Benson - >>echinocereus Stramineus
- Echinocereus fasciculatus (Engelm. ex B.D. Jackson) L. Benson - >>echinocereus Fendleri Var. Fasciculatus
- Echinocereus fasciculatus (Engelm. ex B.D. Jackson) L. Benson var. bonkerae (Thornb. & Bonker) L. Benson - >>echinocereus Fendleri Var. Bonkerae
- Echinocereus fasciculatus (Engelm. ex B.D. Jackson) L. Benson var. boyce-thompsonii (Orcutt) L. Benson - >>echinocereus Fendleri Var. Boyce-thompsonii
- Echinocereus fendleri (Engelm.) F. Seitz - Pinkflower Hedgehog Cactus
- Echinocereus fendleri (Engelm.) F. Seitz var. bonkerae (Thornb. & Bonker) L. Benson - Pinkflower Hedgehog Cactus
- Echinocereus fendleri (Engelm.) F. Seitz var. boyce-thompsonii (Orcutt) L. Benson - Boyce Thompson Hedgehog Cactus
- Echinocereus fendleri (Engelm.) F. Seitz var. fasciculatus (Engelm. ex B.D. Jackson) N.P. Taylor - Pinkflower Hedgehog Cactus
- Echinocereus fendleri (Engelm.) F. Seitz var. fendleri - Pinkflower Hedgehog Cactus
- Echinocereus fendleri (Engelm.) F. Seitz var. kuenzleri (Castetter, Pierce & Schwerin) L. Benson - Kuenzler's Hedgehog Cactus
- Echinocereus fendleri (Engelm.) F. Seitz var. ledingii (Peebles) N.P. Taylor - Leding's Hedgehog Cactus
- Echinocereus fendleri (Engelm.) F. Seitz var. rectispinus (Peebles) L. Benson - Pinkflower Hedgehog Cactus
- Echinocereus fendleri (Engelm.) F. Seitz var. robustus (Peebles) L. Benson - >>echinocereus Fendleri Var. Fasciculatus
- Echinocereus fitchii Britt. & Rose - >>echinocereus Reichenbachii Var. Fitchii
- Echinocereus hempelii auct. non F. Fobe - >>echinocereus Fendleri Var. Kuenzleri
- Echinocereus kuenzleri Castetter, Pierce & Schwerin - >>echinocereus Fendleri Var. Kuenzleri
- Echinocereus kunzei Guerke - >>echinocereus Triglochidiatus Var. Triglochidiatus
- Echinocereus ledingii Peebles - >>echinocereus Fendleri Var. Ledingii
- Echinocereus melanocentrus Lowry - >>echinocereus Reichenbachii Var. Fitchii
- Echinocereus mojavensis (Engelm. & Bigelow) Rumpl. - >>echinocereus Triglochidiatus Var. Mojavensis
- Echinocereus munzii (Parish) L. Benson - >>echinocereus Engelmannii Var. Munzii
- Echinocereus nicholii (L. Benson) Parfitt - Nichol's Hedgehog Cactus
- Echinocereus octacanthus (Muehlenpfordt) Britt. & Rose - >>echinocereus Coccineus Var. Coccineus
- Echinocereus papillosus Linke ex Rumpl. - Allicoche Hedgehog Cactus
- Echinocereus papillosus Linke ex Rumpl. var. angusticeps (Clover) W.T. Marsh. - Allicoche Hedgehog Cactus
- Echinocereus papillosus Linke ex Rumpl. var. papillosus - Allicoche Hedgehog Cactus
- Echinocereus pectinatus (Scheidw.) Engelm. - Rainbow Cactus
- Echinocereus pectinatus (Scheidw.) Engelm. var. ctenoides (Engelm.) Weniger - >>echinocereus Dasyacanthus
- Echinocereus pectinatus (Scheidw.) Engelm. var. dasyacanthus (Engelm.) N.P. Taylor - >>echinocereus Dasyacanthus
- Echinocereus pectinatus (Scheidw.) Engelm. var. minor auct. non (Engelm.) L. Benson - >>echinocereus Pseudopectinatus
- Echinocereus pectinatus (Scheidw.) Engelm. var. neomexicanus (Coult.) L. Benson - >>echinocereus Dasyacanthus
- Echinocereus pectinatus (Scheidw.) Engelm. var. pectinatus - Rainbow Cactus
- Echinocereus pectinatus (Scheidw.) Engelm. var. rigidissimus (Engelm.) Rumpl. - >>echinocereus Rigidissimus
- Echinocereus pectinatus (Scheidw.) Engelm. var. wenigeri L. Benson - Weniger's Hedgehog Cactus
- Echinocereus pentalophus (DC.) Lem. - Ladyfinger Cactus
- Echinocereus perbellus Britt. & Rose - >>echinocereus Reichenbachii Var. Perbellus
- Echinocereus polyacanthus Engelm. - Mojave Mound Cactus
- Echinocereus polyacanthus Engelm. var. neomexicanus auct. non (Standl.) L. Benson - >>echinocereus Coccineus Var. Arizonicus
- Echinocereus polyacanthus Engelm. var. rosei (Woot. & Standl.) Weniger - >>echinocereus Coccineus Var. Coccineus
- Echinocereus poselgeri Lem. - Dahlia Hedgehog Cactus
- Echinocereus pseudopectinatus (N.P. Taylor) N.P. Taylor - Devilthorn
- Echinocereus rectispinus Peebles - >>echinocereus Fendleri Var. Rectispinus
- Echinocereus rectispinus Peebles var. robustus Peebles - >>echinocereus Fendleri Var. Fasciculatus
- Echinocereus reichenbachii (Terscheck ex Walp.) Haage f. - Lace Hedgehog Cactus
- Echinocereus reichenbachii (Terscheck ex Walp.) Haage f. var. albertii L. Benson - >>echinocereus Reichenbachii Var. Fitchii
- Echinocereus reichenbachii (Terscheck ex Walp.) Haage f. var. albispinus (Lahman) L. Benson - >>echinocereus Reichenbachii Var. Baileyi
- Echinocereus reichenbachii (Terscheck ex Walp.) Haage f. var. baileyi (Rose) N.P. Taylor - Bailey's Hedgehog Cactus
- Echinocereus reichenbachii (Terscheck ex Walp.) Haage f. var. chisoensis (W.T. Marsh.) L. Benson - >>echinocereus Chisoensis
- Echinocereus reichenbachii (Terscheck ex Walp.) Haage f. var. fitchii (Britt. & Rose) L. Benson - Fitch's Hedgehog Cactus
- Echinocereus reichenbachii (Terscheck ex Walp.) Haage f. var. perbellus (Britt. & Rose) L. Benson - Lace Hedgehog Cactus
- Echinocereus reichenbachii (Terscheck ex Walp.) Haage f. var. reichenbachii - Lace Hedgehog Cactus
- Echinocereus reichenbachii (Terscheck ex Walp.) Haage f. var. robustus (Peebles) L. Benson - >>echinocereus Fendleri Var. Fasciculatus
- Echinocereus rigidissimus (Engelm.) Haage f. - Rainbow Hedgehog Cactus
- Echinocereus russanthus Weniger - Brownspine Hedgehog Cactus
- Echinocereus stramineus (Engelm.) F. Seitz - Strawberry Hedgehog Cactus
- Echinocereus triglochidiatus Engelm. - Kingcup Cactus
- Echinocereus triglochidiatus Engelm. var. arizonicus (Rose ex Orcutt) L. Benson - >>echinocereus Coccineus Var. Arizonicus
- Echinocereus triglochidiatus Engelm. var. gonacanthus (Engelm. & Bigelow) Boissevain - >>echinocereus Triglochidiatus Var. Triglochidiatus
- Echinocereus triglochidiatus Engelm. var. gurneyi L. Benson - >>echinocereus Coccineus Var. Gurneyi
- Echinocereus triglochidiatus Engelm. var. hexaedrus (Engelm.) Boissevain & C. Davids. - >>echinocereus Coccineus Var. Coccineus
- Echinocereus triglochidiatus Engelm. var. inermis (K. Schum.) Arp - >>echinocereus Coccineus Var. Coccineus
- Echinocereus triglochidiatus Engelm. var. melanacanthus (Engelm.) L. Benson - >>echinocereus Coccineus Var. Coccineus
- Echinocereus triglochidiatus Engelm. var. mojavensis (Engelm. & Bigelow) L. Benson - Mojave Kingcup Cactus
- Echinocereus triglochidiatus Engelm. var. neomexicanus auct. non (Standl.) W.T. Marsh. - >>echinocereus Coccineus Var. Arizonicus
- Echinocereus triglochidiatus Engelm. var. octacanthus (Muehlenpfordt) W.T. Marsh. - >>echinocereus Coccineus Var. Coccineus
- Echinocereus triglochidiatus Engelm. var. paucispinus (Engelm.) W.T. Marsh. - >>echinocereus Coccineus Var. Paucispinus
- Echinocereus triglochidiatus Engelm. var. polyacanthus (Engelm.) L. Benson - >>echinocereus Polyacanthus
- Echinocereus triglochidiatus Engelm. var. toroweapensis P.C. Fischer - Kingcup Cactus
- Echinocereus triglochidiatus Engelm. var. triglochidiatus - Kingcup Cactus
- Echinocereus viridiflorus Engelm. - Nylon Hedgehog Cactus
- Echinocereus viridiflorus Engelm. var. correllii L. Benson - Correll's Hedgehog Cactus
- Echinocereus viridiflorus Engelm. var. cylindricus (Engelm.) Rumpl. - Nylon Hedgehog Cactus
- Echinocereus viridiflorus Engelm. var. davisii (A.D. Houghton) W.T. Marsh. - Davis' Hedgehog Cactus
- Echinocereus viridiflorus Engelm. var. standleyi (Britt. & Rose) Orcutt ex Weniger - >>echinocereus Viridiflorus Var. Viridiflorus
- Echinocereus viridiflorus Engelm. var. viridiflorus - Nylon Hedgehog Cactus
- Echinocereus ×lloydii Britt. & Rose (pro sp.) - >>echinocereus Roetteri
- Echinocereus ×roetteri (Engelm.) Ruempler - Lloyd's Hedgehog Cactus
- Echinomastus acunensis W.T. Marsh. - >>sclerocactus Erectocentrus
- Echinomastus erectocentrus (Coult.) Britt. & Rose - >>sclerocactus Erectocentrus
- Echinomastus erectocentrus (Coult.) Britt. & Rose var. acunensis (W.T. Marsh.) H. Bravo - >>sclerocactus Erectocentrus
- Echinomastus intertextus (Engelm.) Britt. & Rose - >>sclerocactus Intertextus Var. Intertextus
- Echinomastus intertextus (Engelm.) Britt. & Rose var. dasyacanthus (Engelm.) Backeberg - >>sclerocactus Intertextus Var. Dasyacanthus
- Echinomastus johnsonii (Parry ex Engelm.) E.M. Baxter - >>sclerocactus Johnsonii
- Echinomastus mariposensis Hester - >>sclerocactus Mariposensis
- Echinomastus warnockii (L. Benson) Glass & Foster - >>sclerocactus Warnockii
- Echinopsis candicans (Gillies ex Salm-Dyck) F. A. C. Weber ex D. R. Hunt
- Echinopsis pasacana (F.A.C.Weber) Friedrich & G.D.Rowley
- Echinopsis rojasii Cardenas
- Echinopsis spachiana (Lem.) Friedrich & G.D.Rowley
- Echinopsis turbinata Zuccagni
- Echinopsis Zuccagni - Echinopsis
- Epiphyllum ackermanii Haw. - Orchid Cactus
- Epiphyllum Haw. - Climbing Cactus
- Epiphyllum hookeri (Link & Otto) Haw. - >>epiphyllum Phyllanthus Var. Hookeri
- Epiphyllum macropterum (Lem.) Britton & Rose - Orchid Cactus
- Epiphyllum oxypetalum (DC.) Haw. - Dutchman's Pipe Cactus
- Epiphyllum phyllanthus (L.) Haw. - Climbing Cactus
- Epiphyllum phyllanthus (L.) Haw. var. hookeri (Haw.) Kimn. - Climbing Cactus
- Epiphyllum truncatum Haw. - >>schlumbergera Truncata
- Epithelantha A. Weber ex Britt. & Rose - Pingpong Ball Cactus
- Epithelantha bokei L. Benson - >>epithelantha Micromeris Var. Bokei
- Epithelantha micromeris (Engelm.) A. Weber ex Britt. & Rose - Pingpong Ball Cactus
- Epithelantha micromeris (Engelm.) A. Weber ex Britt. & Rose var. bokei (L. Benson) Glass & Foster - Pingpong Ball Cactus
- Epithelantha micromeris (Engelm.) A. Weber ex Britt. & Rose var. micromeris - Pingpong Ball Cactus
- Eriocereus martinii Riccob. - >>harrisia Martinii
- Escobaria albicolumnaria Hester - Column Foxtail Cactus
- Escobaria alversonii (Coult.) N.P. Taylor, comb. nov. ined. - Cushion Foxtail Cactus
- Escobaria bella Britt. & Rose - >>escobaria Emskoetteriana
- Escobaria Britt. & Rose - Foxtail Cactus
- Escobaria chaffeyi Britt. & Rose - >>escobaria Dasyacantha Var. Chaffeyi
- Escobaria dasyacantha (Engelm.) Britt. & Rose - Big Bend Foxtail Cactus
- Escobaria dasyacantha (Engelm.) Britt. & Rose var. chaffeyi (Britt. & Rose) N.P. Taylor - Chaffey's Foxtail Cactus
- Escobaria dasyacantha (Engelm.) Britt. & Rose var. dasyacantha - Big Bend Foxtail Cactus
- Escobaria dasyacantha (Engelm.) Britt. & Rose var. duncanii (Hester) N.P. Taylor - Duncan's Foxtail Cactus
- Escobaria dasyacantha (Engelm.) Britt. & Rose var. varicolor (Tiegel) D.R. Hunt - >>escobaria Tuberculosa
- Escobaria duncanii (Hester) Backeberg - >>escobaria Dasyacantha Var. Duncanii
- Escobaria emskoetteriana (Quehl) Borg - Junior Tom Thumb Cactus
- Escobaria guadalupensis Brack & Heil - Guadalupe Mountain Foxtail Cactus
- Escobaria hesteri (Y. Wright) Buxbaum - Hester's Foxtail Cactus
- Escobaria leei Rose ex Bödecker - >>escobaria Sneedii Var. Leei
- Escobaria minima (Baird) D.R. Hunt - Birdfoot Cactus
- Escobaria missouriensis (Sweet) D.R. Hunt - Missouri Foxtail Cactus
- Escobaria missouriensis (Sweet) D.R. Hunt var. caespitosa (Engelm.) D.R. Hunt - >>escobaria Missouriensis Var. Similis
- Escobaria missouriensis (Sweet) D.R. Hunt var. marstonii (Clover) D.R. Hunt - Marston's Foxtail Cactus
- Escobaria missouriensis (Sweet) D.R. Hunt var. missouriensis - Missouri Foxtail Cactus
- Escobaria missouriensis (Sweet) D.R. Hunt var. robustior (Engelm.) D.R. Hunt - Missouri Foxtail Cactus
- Escobaria missouriensis (Sweet) D.R. Hunt var. similis (Engelm.) N.P. Taylor - Missouri Foxtail Cactus
- Escobaria nellieae (Croizat) Backeberg - >>escobaria Minima
- Escobaria orcuttii Bödecker - Orcutt's Foxtail Cactus
- Escobaria orcuttii Bödecker var. koenigii Castetter, Pierce & Schwerin - >>escobaria Orcuttii
- Escobaria orcuttii Bödecker var. macraxima Castetter, Pierce & Schwerin - >>escobaria Orcuttii
- Escobaria organensis (A.D. Zimmerman) Castetter, Pierce & Schwerin - Organ Mountain Foxtail Cactus
- Escobaria robbinsiorum (W.H. Earle) D.R. Hunt - Cochise Foxtail Cactus
- Escobaria runyonii Britt. & Rose - >>escobaria Emskoetteriana
- Escobaria sandbergii Castetter, Pierce & Schwerin - San Andres Mountain Foxtail Cactus
- Escobaria sneedii Britt. & Rose - Carpet Foxtail Cactus
- Escobaria sneedii Britt. & Rose var. leei (Rose ex Bödecker) D.R. Hunt - Carpet Foxtail Cactus
- Escobaria sneedii Britt. & Rose var. sneedii - Carpet Foxtail Cactus
- Escobaria strobiliformis auct. non (Poselg.) Scheer ex Bödecker - >>escobaria Tuberculosa
- Escobaria tuberculosa (Engelm.) Britt. & Rose - Whitecolumn Foxtail Cactus
- Escobaria tuberculosa (Engelm.) Britt. & Rose var. varicolor (Tiegel) Brack & Heil - >>escobaria Tuberculosa
- Escobaria villardii Castetter, Pierce & Schwerin - Sacramento Mountain Foxtail Cactus
- Escobaria vivipara (Nutt.) Buxbaum - Spinystar
- Escobaria vivipara (Nutt.) Buxbaum var. alversonii (Coult.) D.R. Hunt - >>escobaria Alversonii
- Escobaria vivipara (Nutt.) Buxbaum var. arizonica (Engelm.) D.R. Hunt - Arizona Spinystar
- Escobaria vivipara (Nutt.) Buxbaum var. bisbeeana (Orcutt) D.R. Hunt - Bisbee Spinystar
- Escobaria vivipara (Nutt.) Buxbaum var. buoflama (P.C. Fischer) N.P. Taylor - Spinystar
- Escobaria vivipara (Nutt.) Buxbaum var. deserti (Engelm.) D.R. Hunt - Desert Spinystar
- Escobaria vivipara (Nutt.) Buxbaum var. kaibabensis (P.C. Fischer) N.P. Taylor - Kaibab Spinystar
- Escobaria vivipara (Nutt.) Buxbaum var. neomexicana (Engelm.) Buxbaum - New Mexico Spinystar
- Escobaria vivipara (Nutt.) Buxbaum var. radiosa (Engelm.) D.R. Hunt - Spinystar
- Escobaria vivipara (Nutt.) Buxbaum var. rosea (Clokey) D.R. Hunt - Spinystar
- Escobaria vivipara (Nutt.) Buxbaum var. vivipara - Spinystar
- Ferocactus acanthodes (Lem.) Britt. & Rose - >>ferocactus Cylindraceus Var. Cylindraceus
- Ferocactus acanthodes (Lem.) Britt. & Rose var. eastwoodiae L. Benson - >>ferocactus Cylindraceus Var. Eastwoodiae
- Ferocactus acanthodes (Lem.) Britt. & Rose var. lecontei (Engelm.) Lindsay - >>ferocactus Cylindraceus Var. Lecontei
- Ferocactus Britt. & Rose - Barrel Cactus
- Ferocactus covillei Britt. & Rose - >>ferocactus Emoryi
- Ferocactus cylindraceus (Engelm.) Orcutt - California Barrel Cactus
- Ferocactus cylindraceus (Engelm.) Orcutt var. cylindraceus - California Barrel Cactus
- Ferocactus cylindraceus (Engelm.) Orcutt var. eastwoodiae (Engelm.) N.P. Taylor - California Barrel Cactus
- Ferocactus cylindraceus (Engelm.) Orcutt var. lecontei (Engelm.) H. Bravo - Leconte's Barrel Cactus
- Ferocactus eastwoodiae (L. Benson) L. Benson - >>ferocactus Cylindraceus Var. Eastwoodiae
- Ferocactus emoryi (Engelm.) Orcutt - Emory's Barrel Cactus
- Ferocactus hamatacanthus (Muehlenpfordt) Britt. & Rose - Turk's Head
- Ferocactus hamatacanthus (Muehlenpfordt) Britt. & Rose var. hamatacanthus - Turk's Head
- Ferocactus hamatacanthus (Muehlenpfordt) Britt. & Rose var. sinuatus (A. Dietr.) L. Benson - Turk's Head
- Ferocactus lecontei (Engelm.) Britt. & Rose - >>ferocactus Cylindraceus Var. Lecontei
- Ferocactus setispinus (Engelm.) L. Benson - >>thelocactus Setispinus
- Ferocactus uncinatus (Galeotti) Britt. & Rose var. wrightii (Engelm.) N.P. Taylor - >>sclerocactus Uncinatus Var. Wrightii
- Ferocactus viridescens (Torr. & Gray) Britt. & Rose - San Diego Barrelcactus
- Ferocactus wislizeni (Engelm.) Britt. & Rose - Candy Barrelcactus
- Glandulicactus uncinatus (Engelm.) Backeberg var. wrightii Backeberg - >>sclerocactus Uncinatus Var. Wrightii
- Hamatocactus Britton & Rose - Hamatocactus
- Hamatocactus hamatocanthus (Muhlph.) F.M. Kunth
- Harrisia aboriginum Small - Prickly Applecactus
- Harrisia bonplandii (Parmentier) Britt. & Rose - >>harrisia Pomanensis
- Harrisia Britt. - Applecactus
- Harrisia fragrans Small - Caribbean Applecactus
- Harrisia martinii (Labour.) Britton
- Harrisia martinii (Labouret) Britt. - Mooncactus
- Harrisia pomanensis Weber - Applecactus
- Harrisia portoricensis Britt. - Puerto Rico Applecactus
- Harrisia simpsonii Small - Simpson's Applecactus
- Hatiora Britton & Rose - Hatiora
- Homalocephala texensis (Hopffer) Britt. & Rose - >>echinocactus Texensis
- Hylocereus (Berger) Britt. & Rose - Nightblooming Cactus
- Hylocereus costaricensis (Weber) Britt. & Rose - Costa Rica Nightblooming Cactus
- Hylocereus triangularis (L.) Britton & Rose
- Hylocereus trigonus (Haw.) Safford - Strawberry-pear
- Hylocereus undatus (Haw.) Britt. & Rose - Nightblooming Cactus
- Hylocereus undatus (Haw.) Britton & Rose
- Lemaireocereus hystrix (Haw.) Salm-Dyck - >>stenocereus Fimbriatus
- Lemaireocereus thurberi (Engelm.) Britt. & Rose - >>stenocereus Thurberi
- Leptocereus (Berger) Britt. & Rose - Leptocereus
- Leptocereus grantianus Britt. - Sebucan
- Leptocereus quadricostatus (Bello) Britt. & Rose - Pitahaya
- Lobivia arachnacantha Buining & F. Ritter
- Lobivia Britton & Rose - Lobivia
- Lobivia caespitosa (J.A. Purpus) Britton & Rose
- Lobivia corbula (Herrera) Britton & Rose
- Lobivia famatinensis (Speg.) Britton & Rose
- Lobivia lateritia (Guerke) Britton & Rose
- Lophocereus schottii (Engelm.) Britt. & Rose - >>pachycereus Schottii
- Lophophora Coult. - Lophophora
- Lophophora williamsii (Lem. ex Salm-Dyck) Coult. - Peyote
- Lophophora williamsii (Lem. ex Salm-Dyck) Coult. var. echinata (Croizat) H. Bravo - >>lophophora Williamsii
- Mammillaria aggregata Engelm. - >>echinocereus Coccineus Var. Coccineus
- Mammillaria albicolumnaria (Hester) Weniger - >>escobaria Albicolumnaria
- Mammillaria alversonii (Coult.) Coult. ex Zeissold - >>escobaria Alversonii
- Mammillaria arizonica Engelm. - >>escobaria Vivipara Var. Arizonica
- Mammillaria bella (Britt. & Rose) Weniger - >>escobaria Emskoetteriana
- Mammillaria conoidea DC. - >>neolloydia Conoidea
- Mammillaria dasyacantha Engelm. - >>escobaria Dasyacantha Var. Dasyacantha
- Mammillaria deserti Engelm. - >>escobaria Vivipara Var. Deserti
- Mammillaria dioica K. Brandeg. - Strawberry Cactus
- Mammillaria dioica K. Brandeg. var. incerta (Parish) Munz - >>mammillaria Dioica
- Mammillaria duncanii (Hester) Weniger - >>escobaria Dasyacantha Var. Duncanii
- Mammillaria echinus Engelm. - >>coryphantha Echinus
- Mammillaria fasciculata Engelm. ex B.D. Jackson - >>echinocereus Fendleri Var. Fasciculatus
- Mammillaria fissurata Engelm. - >>ariocarpus Fissuratus
- Mammillaria fragrans (Hester) Weniger - >>escobaria Vivipara Var. Radiosa
- Mammillaria grahamii Engelm. - Graham's Nipple Cactus
- Mammillaria grahamii Engelm. var. grahamii - Graham's Nipple Cactus
- Mammillaria grahamii Engelm. var. oliviae (Orcutt) L. Benson - Graham's Nipple Cactus
- Mammillaria gummifera Engelm. p.p. - >>mammillaria Heyderi Var. Macdougalii
- Mammillaria gummifera Engelm. var. applanata (Engelm.) L. Benson - >>mammillaria Heyderi Var. Heyderi
- Mammillaria gummifera Engelm. var. hemisphaerica (Engelm.) L. Benson - >>mammillaria Heyderi Var. Hemisphaerica
- Mammillaria gummifera Engelm. var. macdougalii (Rose) L. Benson - >>mammillaria Heyderi Var. Macdougalii
- Mammillaria gummifera Engelm. var. meiacantha (Engelm.) L. Benson - >>mammillaria Heyderi Var. Meiacantha
- Mammillaria Haw. - Globe Cactus
- Mammillaria hesteri (Y. Wright) Weniger - >>escobaria Hesteri
- Mammillaria heyderi Muehlenpfordt - Little Nipple Cactus
- Mammillaria heyderi Muehlenpfordt var. applanata Engelm. - >>mammillaria Heyderi Var. Heyderi
- Mammillaria heyderi Muehlenpfordt var. bullingtoniana Castetter, Pierce & Schwerin - Little Nipple Cactus
- Mammillaria heyderi Muehlenpfordt var. hemisphaerica Engelm. - Little Nipple Cactus
- Mammillaria heyderi Muehlenpfordt var. heyderi - Little Nipple Cactus
- Mammillaria heyderi Muehlenpfordt var. macdougalii (Rose) L. Benson - Macdougal's Nipple Cactus
- Mammillaria heyderi Muehlenpfordt var. meiacantha (Engelm.) L. Benson - Little Nipple Cactus
- Mammillaria lasiacantha Engelm. - Lacespine Nipple Cactus
- Mammillaria lasiacantha Engelm. var. denudata Engelm. - >>mammillaria Lasiacantha
- Mammillaria leei (Rose ex Bödecker) Weniger - >>escobaria Sneedii Var. Leei
- Mammillaria longimamma DC. var. sphaerica (A. Dietr.) K. Brandeg. - >>mammillaria Sphaerica
- Mammillaria macdougalii Rose - >>mammillaria Heyderi Var. Macdougalii
- Mammillaria macromeris Engelm. - >>coryphantha Macromeris Var. Macromeris
- Mammillaria mainiae K. Brandeg. - Counterclockwise Nipple Cactus
- Mammillaria matudae Bravo
- Mammillaria meiacantha Engelm. - >>mammillaria Heyderi Var. Meiacantha
- Mammillaria meridiorosei Castetter, Pierce & Schwerin - >>mammillaria Wrightii Var. Wilcoxii
- Mammillaria microcarpa Engelm. - >>mammillaria Grahamii Var. Grahamii
- Mammillaria microcarpa Engelm. var. auricarpa W.T. Marsh. - >>mammillaria Grahamii Var. Grahamii
- Mammillaria micromeris Engelm. - >>epithelantha Micromeris Var. Micromeris
- Mammillaria milleri (Britt. & Rose) Bödecker - >>mammillaria Grahamii Var. Grahamii
- Mammillaria missouriensis Sweet - >>escobaria Missouriensis Var. Missouriensis
- Mammillaria multiceps Salm-Dyck - >>mammillaria Prolifera Var. Texana
- Mammillaria nellieae (Croizat) Croizat - >>escobaria Minima
- Mammillaria neomexicana Engelm. - >>escobaria Vivipara Var. Neomexicana
- Mammillaria nickelsiae K. Brandeg. - >>coryphantha Nickelsiae
- Mammillaria nivosa Link ex N.E. Pfeiffer - Woolly Nipple Cactus
- Mammillaria oliviae Orcutt - >>mammillaria Grahamii Var. Oliviae
- Mammillaria orestera L. Benson - >>mammillaria Viridiflora
- Mammillaria painteri Rose
- Mammillaria pottsii Scheer ex Salm-Dyck - Rat-tail Nipple Cactus
- Mammillaria prolifera (P. Mill.) Haw. - Texas Nipple Cactus
- Mammillaria prolifera (P. Mill.) Haw. var. texana (Engelm.) Borg - Texas Nipple Cactus
- Mammillaria ramillosa (Cutak) Weiniger - >>coryphantha Ramillosa
- Mammillaria recurvata Engelm. - >>coryphantha Recurvata
- Mammillaria rhodantha Link & Otto
- Mammillaria robertii (Berger) Weniger - >>escobaria Emskoetteriana
- Mammillaria robustispina Schott ex Engelm. - >>coryphantha Scheeri Var. Robustispina
- Mammillaria roseiflora (Lahman) Weniger - >>escobaria Missouriensis Var. Similis
- Mammillaria runyonii (Britt. & Rose) Cory - >>coryphantha Macromeris Var. Runyonii
- Mammillaria scheeri Muehlenpfordt - >>coryphantha Scheeri Var. Scheeri
- Mammillaria similis Engelm. - >>escobaria Missouriensis Var. Similis
- Mammillaria similis Engelm. var. robustior Engelm. - >>escobaria Missouriensis Var. Robustior
- Mammillaria sneedii (Britt. & Rose) Cory - >>escobaria Sneedii Var. Sneedii
- Mammillaria sphaerica A. Dietr. - Longmamma Nipple Cactus
- Mammillaria sulcata Engelm. - >>coryphantha Sulcata
- Mammillaria tetrancistra Engelm. - Common Fishhook Cactus
- Mammillaria thornberi Orcutt - Thornber's Nipple Cactus
- Mammillaria tuberculosa Engelm. - >>escobaria Tuberculosa
- Mammillaria varicolor (Tiegel) Weniger - >>escobaria Tuberculosa
- Mammillaria viridiflora (Britt. & Rose) Bödecker - Greenflower Nipple Cactus
- Mammillaria vivipara (Nutt.) Haw. - >>escobaria Vivipara Var. Vivipara
- Mammillaria vivipara (Nutt.) Haw. var. arizonica (Engelm.) L. Benson - >>escobaria Vivipara Var. Arizonica
- Mammillaria vivipara (Nutt.) Haw. var. borealis Engelm. - >>escobaria Vivipara Var. Vivipara
- Mammillaria vivipara (Nutt.) Haw. var. deserti (Engelm.) Weniger - >>escobaria Vivipara Var. Deserti
- Mammillaria vivipara (Nutt.) Haw. var. neomexicana (Engelm.) Engelm. - >>escobaria Vivipara Var. Neomexicana
- Mammillaria vivipara (Nutt.) Haw. var. radiosa Engelm. - >>escobaria Vivipara Var. Radiosa
- Mammillaria wilcoxii Toumey ex K. Schum. - >>mammillaria Wrightii Var. Wilcoxii
- Mammillaria wrightii Engelm. - Wright's Nipple Cactus
- Mammillaria wrightii Engelm. var. wilcoxii (Toumey ex K. Schum.) W.T. Marsh. - Wilcox's Nipple Cactus
- Mammillaria wrightii Engelm. var. wrightii - Wright's Nipple Cactus
- Melocactus intortus (P. Mill.) Urban - Turk's Cap
- Melocactus Link & Otto - Melocactus
- Neobesseya missouriensis (Sweet) Britt. & Rose - >>escobaria Missouriensis Var. Missouriensis
- Neobesseya wissmannii (Hildmann ex K. Schum.) Britt. & Rose - >>escobaria Missouriensis Var. Missouriensis
- Neoevansia striata (Brandeg.) Sánchez-Mejorada - >>peniocereus Striatus
- Neolloydia Britt. & Rose - Neolloydia
- Neolloydia conoidea (DC.) Britt. & Rose - Chihuahuan Beehive
- Neolloydia erectocentra (Coult.) L. Benson - >>sclerocactus Erectocentrus
- Neolloydia erectocentra (Coult.) L. Benson var. acunensis (W.T. Marsh.) L. Benson - >>sclerocactus Erectocentrus
- Neolloydia gautii L. Benson - >>turbinicarpus Gautii
- Neolloydia intertexta (Engelm.) L. Benson - >>sclerocactus Intertextus Var. Intertextus
- Neolloydia intertexta (Engelm.) L. Benson var. dasyacantha (Engelm.) L. Benson - >>sclerocactus Intertextus Var. Dasyacanthus
- Neolloydia johnsonii (Parry ex Engelm.) L. Benson - >>sclerocactus Johnsonii
- Neolloydia johnsonii (Parry ex Engelm.) L. Benson var. lutescens (Parish) W.T. Marsh. ex R.G. Engard - >>sclerocactus Johnsonii
- Neolloydia mariposensis (Hester) L. Benson - >>sclerocactus Mariposensis
- Neolloydia warnockii L. Benson - >>sclerocactus Warnockii
- Neomammillaria nivosa (Link ex N.E. Pfeiffer) Britt. & Rose - >>mammillaria Nivosa
- Neomammillaria similis (Engelm.) Britt. & Rose ex Rydb. - >>escobaria Missouriensis Var. Similis
- Nopalea cochenillifera (L.) Salm-Dyck - >>opuntia Cochenillifera
- Nopalea cochenillifera (L.) Salm-Dyck
- Notocactus (K.M. Schumann) Backeb. & F.M. Knuth - Notocactus
- Notocactus tabularis (Monv.) N.P. Taylor - >>parodia Concinna
- Opuntia abjecta Small - >>opuntia Triacantha
- Opuntia acanthocarpa Engelm. & Bigelow - Buckhorn Cholla
- Opuntia acanthocarpa Engelm. & Bigelow ssp. ganderi C.B. Wolf - >>opuntia Ganderi
- Opuntia acanthocarpa Engelm. & Bigelow var. acanthocarpa - Buckhorn Cholla
- Opuntia acanthocarpa Engelm. & Bigelow var. coloradensis L. Benson - Colorado Buckhorn Cholla
- Opuntia acanthocarpa Engelm. & Bigelow var. ganderi (C.B. Wolf) L. Benson - >>opuntia Ganderi
- Opuntia acanthocarpa Engelm. & Bigelow var. major (Engelm. & Bigelow) L. Benson - Buckhorn Cholla
- Opuntia acanthocarpa Engelm. & Bigelow var. thornberi (Thornb. & Bonker) L. Benson - Thornber's Buckhorn Cholla
- Opuntia aggeria B.E. Ralston & Hilsenbeck - Big Bend Pricklypear
- Opuntia ammophila Small - >>opuntia Humifusa Var. Ammophila
- Opuntia antillana Britt. & Rose - >>opuntia Cubensis
- Opuntia arborescens Engelm. - >>opuntia Imbricata Var. Imbricata
- Opuntia arbuscula Engelm. - Arizona Pencil Cholla
- Opuntia arenaria Engelm. - El Paso Pricklypear
- Opuntia arizonica Griffiths - >>opuntia Phaeacantha Var. Major
- Opuntia atrispina Griffiths - Border Pricklypear
- Opuntia atrocapensis Small - >>opuntia Stricta Var. Dillenii
- Opuntia aurantiaca Lindl. - Tiger-pear
- Opuntia aurantiaca Lindl.
- Opuntia aurea E.M. Baxter - Golden Pricklypear
- Opuntia aureispina (Brack & Heil) Pinkava & Parfitt - Rio Grande Pricklypear
- Opuntia austrina Small - >>opuntia Humifusa Var. Austrina
- Opuntia ballii Rose - >>opuntia Macrorhiza Var. Pottsii
- Opuntia barkleyana (Daston) Rowley - >>opuntia Pulchella
- Opuntia basilaris Engelm. & Bigelow - Beavertail Pricklypear
- Opuntia basilaris Engelm. & Bigelow var. aurea (E.M. Baxter) W.T. Marsh. - >>opuntia Aurea
- Opuntia basilaris Engelm. & Bigelow var. basilaris - Beavertail Pricklypear
- Opuntia basilaris Engelm. & Bigelow var. brachyclada (Griffiths) Munz - Beavertail Pricklypear
- Opuntia basilaris Engelm. & Bigelow var. heilii Welsh & Neese - Heil's Beavertail Pricklypear
- Opuntia basilaris Engelm. & Bigelow var. longiareolata (Clover & Jotter) L. Benson - Beavertail Pricklypear
- Opuntia basilaris Engelm. & Bigelow var. ramosa Parish - >>opuntia Basilaris Var. Basilaris
- Opuntia basilaris Engelm. & Bigelow var. treleasei (Coult.) Coult. ex Toumey - Trelease's Beavertail Pricklypear
- Opuntia basilaris Engelm. & Bigelow var. whitneyana (E.M. Baxter) E.M. Baxter ex W.T. Marsh. - >>opuntia Basilaris Var. Basilaris
- Opuntia basilaris Engelm. & Bigelow var. woodburyi W.H. Earle - >>opuntia Pinkavae
- Opuntia bentonii Griffiths - >>opuntia Stricta Var. Stricta
- Opuntia bigelovii Engelm. - Teddybear Cholla
- Opuntia bigelovii Engelm. var. hoffmannii Fosberg - >>opuntia Fosbergii
- Opuntia borinquensis Britt. & Rose - Olaga
- Opuntia brachyarthra Engelm. & Bigelow - >>opuntia Fragilis Var. Brachyarthra
- Opuntia brachyclada Griffiths - >>opuntia Basilaris Var. Brachyclada
- Opuntia brachyclada Griffiths ssp. humistrata (Griffiths) Wiggins & Wolf - >>opuntia Basilaris Var. Basilaris
- Opuntia brachyrhopalica (Daston) Rowley - >>opuntia Pulchella
- Opuntia brasiliensis (Willd.) Haw. - Brazilian Pricklypear
- Opuntia calcicola Wherry - >>opuntia Humifusa Var. Humifusa
- Opuntia californica (Torr. & Gray) Coville - California Pricklypear
- Opuntia californica (Torr. & Gray) Coville var. californica - California Pricklypear
- Opuntia californica (Torr. & Gray) Coville var. parkeri (Coult.) Pinkava - Brownspined Pricklypear
- Opuntia californica Engelm. - >>opuntia Tetracantha
- Opuntia camanchica Engelm. & Bigelow - >>opuntia Phaeacantha Var. Camanchica
- Opuntia canada Griffiths - >>opuntia Phaeacantha Var. Major
- Opuntia charlestonensis Clokey - Plateau Prickly Pear
- Opuntia chihuahuensis Rose - Chihuahua Pricklypear
- Opuntia chisosensis (Anthony) Ferguson - Chisos Mountain Pricklypear
- Opuntia chlorotica Engelm. & Bigelow - Dollarjoint Pricklypear
- Opuntia chlorotica Engelm. & Bigelow var. gosseliniana (A. Weber) Ferguson - >>opuntia Gosseliniana
- Opuntia chlorotica Engelm. & Bigelow var. santa-rita Griffiths & Hare - >>opuntia Santa-rita
- Opuntia clavata Engelm. - Club Cholla
- Opuntia cochenillifera (L.) Mill.
- Opuntia cochenillifera (L.) P. Mill. - Cochineal Nopal Cactus
- Opuntia columbiana Griffiths - >>opuntia Erinacea Var. Columbiana
- Opuntia compressa - Indian Fig
- Opuntia compressa auct. non J.F. Macbr. - >>opuntia Humifusa Var. Humifusa
- Opuntia compressa J.F. Macbr. - >>opuntia Ficus-indica
- Opuntia compressa J.F. Macbr. var. allairei (Griffiths) Weniger - >>opuntia Humifusa Var. Humifusa
- Opuntia compressa J.F. Macbr. var. ammophila (Small) L. Benson - >>opuntia Humifusa Var. Ammophila
- Opuntia compressa J.F. Macbr. var. austrina (Small) L. Benson - >>opuntia Humifusa Var. Austrina
- Opuntia compressa J.F. Macbr. var. fuscoatra (Engelm.) Weniger - >>opuntia Humifusa Var. Humifusa
- Opuntia compressa J.F. Macbr. var. grandiflora (Engelm.) Weniger - >>opuntia Macrorhiza Var. Macrorhiza
- Opuntia compressa J.F. Macbr. var. macrorhiza (Engelm.) L. Benson - >>opuntia Macrorhiza Var. Macrorhiza
- Opuntia compressa J.F. Macbr. var. microsperma (Engelm. & Bigelow) L. Benson - >>opuntia Humifusa Var. Humifusa
- Opuntia compressa J.F. Macbr. var. stenochila (Engelm.) Weniger - >>opuntia Macrorhiza Var. Macrorhiza
- Opuntia compressa J.F.Macbr.
- Opuntia covillei Britt. & Rose - >>opuntia Littoralis Var. Vaseyi
- Opuntia covillei Britt. & Rose var. piercei (Fosberg) Munz - >>opuntia Littoralis Var. Piercei
- Opuntia cumulicola Small - >>opuntia Humifusa Var. Austrina
- Opuntia cymochila Engelm. & Bigelow - Grassland Pricklypear
- Opuntia davisii Engelm. & Bigelow - >>opuntia Tunicata Var. Davisii
- Opuntia densispina B.E. Ralston & R.A. Hilsenbeck - Big Bend Pricklypear
- Opuntia dillei Griffiths - >>opuntia Engelmannii Var. Engelmannii
- Opuntia dillenii (Ker Gawl.) Haw.
- Opuntia dillenii (Ker-Gawl.) Haw. - >>opuntia Stricta Var. Dillenii
- Opuntia discata Griffiths - Smallfruit Pricklypear
- Opuntia drummondii Graham - >>opuntia Pusilla
- Opuntia dulcis Engelm. - >>opuntia Phaeacantha Var. Phaeacantha
- Opuntia eburnispina Small - >>opuntia Humifusa Var. Austrina
- Opuntia echinocarpa Engelm. & Bigelow - Golden Cholla
- Opuntia echinocarpa Engelm. & Bigelow var. major Engelm. & Bigelow - >>opuntia Acanthocarpa Var. Major
- Opuntia echinocarpa Engelm. & Bigelow var. parkeri (Engelm.) Coult. - >>opuntia Californica Var. Parkeri
- Opuntia echinocarpa Engelm. & Bigelow var. wolfii L. Benson - >>opuntia Wolfii
- Opuntia edwardsii V.& K. Grant - Edwards' Pricklypear
- Opuntia emoryi auct. non Engelm. - >>opuntia Parishii
- Opuntia emoryi Engelm. - >>opuntia Kunzei
- Opuntia engelmannii Salm-Dyck - Cactus Apple
- Opuntia engelmannii Salm-Dyck var. aciculata (Griffiths) Weniger - >>opuntia Engelmannii Var. Lindheimeri
- Opuntia engelmannii Salm-Dyck var. alta (Griffiths) Weniger - >>opuntia Engelmannii Var. Lindheimeri
- Opuntia engelmannii Salm-Dyck var. cacanapa (Griffiths) Weniger - >>opuntia Engelmannii Var. Lindheimeri
- Opuntia engelmannii Salm-Dyck var. cuija Griffiths & Hare - Cactus Apple
- Opuntia engelmannii Salm-Dyck var. cycloides Engelm. & Bigelow - >>opuntia Phaeacantha Var. Major
- Opuntia engelmannii Salm-Dyck var. dulcis (Engelm.) Engelm. ex K. Schum. - >>opuntia Engelmannii Var. Lindheimeri
- Opuntia engelmannii Salm-Dyck var. engelmannii - Cactus Apple
- Opuntia engelmannii Salm-Dyck var. flavispina (L. Benson) Parfitt & Pinkava - Cactus Apple
- Opuntia engelmannii Salm-Dyck var. flexospina (Griffiths) Parfitt & Pinkava - Cactus Apple
- Opuntia engelmannii Salm-Dyck var. lindheimeri (Engelm.) Parfitt & Pinkava - Texas Pricklypear
- Opuntia engelmannii Salm-Dyck var. linguiformis (Griffiths) Parfitt & Pinkava - Cactus Apple
- Opuntia engelmannii Salm-Dyck var. littoralis Engelm. - >>opuntia Littoralis Var. Littoralis
- Opuntia engelmannii Salm-Dyck var. texana (Griffiths) Weniger - >>opuntia Engelmannii Var. Lindheimeri
- Opuntia engelmannii Salm-Dyck var. wootonii (Griffiths) Fosberg - >>opuntia Phaeacantha Var. Wootonii
- Opuntia erinacea Engelm. & Bigelow ex Engelm. - Grizzlybear Pricklypear
- Opuntia erinacea Engelm. & Bigelow ex Engelm. var. aurea (E.M. Baxter) Welsh - >>opuntia Aurea
- Opuntia erinacea Engelm. & Bigelow ex Engelm. var. columbiana (Griffiths) L. Benson - Grizzleybear Pricklypear
- Opuntia erinacea Engelm. & Bigelow ex Engelm. var. erinacea - Grizzlybear Pricklypear
- Opuntia erinacea Engelm. & Bigelow ex Engelm. var. hystricina (Engelm. & Bigelow) L. Benson - Grizzlybear Pricklypear
- Opuntia erinacea Engelm. & Bigelow ex Engelm. var. paucispina Dunkle - >>opuntia Erinacea Var. Utahensis
- Opuntia erinacea Engelm. & Bigelow ex Engelm. var. ursina (A. Weber) Parish - Grizzlybear Pricklypear
- Opuntia erinacea Engelm. & Bigelow ex Engelm. var. utahensis (Engelm.) L. Benson - Utah Grizzlybear Pricklypear
- Opuntia erinacea Engelm. & Bigelow ex Engelm. var. xanthostemma (K. Schum. ex Hirscht-Zehl.) L. Benson - >>opuntia Erinacea Var. Utahensis
- Opuntia exaltata A.Berger
- Opuntia ficus-indica - Prickly Pear
- Opuntia ficus-indica (L.) Mill.
- Opuntia ficus-indica (L.) P. Mill. - Tuna Cactus
- Opuntia flexospina Griffiths - >>opuntia Engelmannii Var. Flexospina
- Opuntia fosbergii C.B. Wolf - Hoffmann's Teddybear Cholla
- Opuntia fragilis - Prickly Pear
- Opuntia fragilis (Nutt.) Haw. - Brittle Pricklypear
- Opuntia fragilis (Nutt.) Haw. ssp. brachyarthra (Engelm. & Bigelow) W.A. Weber - >>opuntia Fragilis Var. Brachyarthra
- Opuntia fragilis (Nutt.) Haw. var. brachyarthra (Engelm. & Bigelow) Coult. - Brittle Pricklypear
- Opuntia fragilis (Nutt.) Haw. var. denudata Wieg. & Backeberg - >>opuntia Fragilis Var. Fragilis
- Opuntia fragilis (Nutt.) Haw. var. fragilis - Brittle Pricklypear
- Opuntia fulgida Engelm. - Jumping Cholla
- Opuntia fulgida Engelm. var. fulgida - Jumping Cholla
- Opuntia fulgida Engelm. var. mamillata (Schott ex Engelm.) Coult. - Jumping Cholla
- Opuntia ganderi (C.B. Wolf) J. Rebman & Pinkava - Gander's Buckhorn Cholla
- Opuntia gilvescens Griffiths - >>opuntia Phaeacantha Var. Major
- Opuntia gosseliniana A. Weber - Violet Pricklypear
- Opuntia gracilicylindrica (Wieg. & Backeberg) Rowley - >>opuntia Pulchella
- Opuntia grahamii Engelm. - Graham's Pricklypear
- Opuntia grandiflora Engelm. - >>opuntia Macrorhiza Var. Macrorhiza
- Opuntia heacockiae Arp - Heacock's Pricklypear
- Opuntia howeyi
- Opuntia humifusa (Raf.) Raf. - Devil's-tongue
- Opuntia humifusa (Raf.) Raf. var. ammophila (Small) L. Benson - Devil's-tongue
- Opuntia humifusa (Raf.) Raf. var. austrina (Small) Dress - Devil's-tongue
- Opuntia humifusa (Raf.) Raf. var. humifusa - Devil's-tongue
- Opuntia hystricina Engelm. & Bigelow - >>opuntia Erinacea Var. Hystricina
- Opuntia imbricata - Tree Chola
- Opuntia imbricata (Haw.) DC. - Tree Cholla
- Opuntia imbricata (Haw.) DC.
- Opuntia imbricata (Haw.) DC. var. arborescens (Engelm.) Weniger - >>opuntia Imbricata Var. Imbricata
- Opuntia imbricata (Haw.) DC. var. argentea Anthony - Tree Cholla
- Opuntia imbricata (Haw.) DC. var. imbricata - Tree Cholla
- Opuntia imbricata (Haw.) DC. var. vexans (Griffiths) Weniger - >>opuntia Imbricata Var. Imbricata
- Opuntia imbricata (Haw.) DC. var. viridiflora (Britt. & Rose) Weniger - >>opuntia Viridiflora
- Opuntia impedata Small - >>opuntia Humifusa Var. Ammophila
- Opuntia juniperina Britt. & Rose - >>opuntia Polyacantha Var. Juniperina
- Opuntia kleiniae DC. - Candle Cholla
- Opuntia kleiniae DC. var. tetracantha (Toumey) W.T. Marsh. - >>opuntia Tetracantha
- Opuntia kunzei Rose - Devil's Cholla
- Opuntia laevis Coult. - >>opuntia Phaeacantha Var. Laevis
- Opuntia lata Small - >>opuntia Humifusa Var. Ammophila
- Opuntia leptocarpa MacKensen - >>opuntia Macrorhiza Var. Macrorhiza
- Opuntia leptocaulis DC.
- Opuntia leucotricha DC. - Arborescent Pricklypear
- Opuntia lindheimeri Engelm. - >>opuntia Engelmannii Var. Lindheimeri
- Opuntia lindheimeri Engelm.
- Opuntia lindheimeri Engelm. var. chisosensis Anthony - >>opuntia Chisosensis
- Opuntia lindheimeri Engelm. var. cuija (Griffiths & Hare) L. Benson - >>opuntia Engelmannii Var. Cuija
- Opuntia lindheimeri Engelm. var. lehmannii L. Benson - >>opuntia Engelmannii Var. Lindheimeri
- Opuntia lindheimeri Engelm. var. linguiformis (Griffiths) L. Benson - >>opuntia Engelmannii Var. Linguiformis
- Opuntia lindheimeri Engelm. var. tricolor (Griffiths) L. Benson - >>opuntia Engelmannii Var. Lindheimeri
- Opuntia linguiformis Griffiths - >>opuntia Engelmannii Var. Linguiformis
- Opuntia linguiformis Griffiths
- Opuntia littoralis
- Opuntia littoralis (Engelm.) Cockerell - Coastal Pricklypear
- Opuntia littoralis (Engelm.) Cockerell var. austrocalifornica L. Benson & Walkington - Coastal Pricklypear
- Opuntia littoralis (Engelm.) Cockerell var. littoralis - Coastal Pricklypear
- Opuntia littoralis (Engelm.) Cockerell var. martiniana (L. Benson) L. Benson - >>opuntia Martiniana
- Opuntia littoralis (Engelm.) Cockerell var. piercei (Fosberg) L. Benson & Walkington - Coastal Pricklypear
- Opuntia littoralis (Engelm.) Cockerell var. vaseyi (Coult.) L. Benson & Walkington - Vasey's Coastal Pricklypear
- Opuntia longiareolata Clover & Jotter - >>opuntia Basilaris Var. Longiareolata
- Opuntia mackensenii Rose - >>opuntia Macrorhiza Var. Macrorhiza
- Opuntia macrantha Gibbes - >>opuntia Stricta Var. Stricta
- Opuntia macrocentra Engelm. - Purple Pricklypear
- Opuntia macrocentra Engelm. var. aureispina Brack & Heil - >>opuntia Aureispina
- Opuntia macrocentra Engelm. var. macrocentra - Purple Pricklypear
- Opuntia macrocentra Engelm. var. martiniana L. Benson - >>opuntia Martiniana
- Opuntia macrocentra Engelm. var. minor Anthony - Purple Pricklypear
- Opuntia macrorhiza - Twist-spine Prickly Pear
- Opuntia macrorhiza Engelm. - Twistspine Pricklypear
- Opuntia macrorhiza Engelm. var. macrorhiza - Twistspine Pricklypear
- Opuntia macrorhiza Engelm. var. pottsii (Salm-Dyck) L. Benson - Twistspine Pricklypear
- Opuntia magnifica Small - >>opuntia Stricta Var. Stricta
- Opuntia mamillata Schott ex Engelm. - >>opuntia Fulgida Var. Mamillata
- Opuntia martiniana (L. Benson) Parfitt - Seashore Cactus
- Opuntia megacarpa Griffiths - >>opuntia Engelmannii Var. Engelmannii
- Opuntia microcarpa Engelm. ex B.D. Jackson - >>opuntia Discata
- Opuntia microdasys - Bunny Ears
- Opuntia microdasys (Lehm.) Pfeiff.
- Opuntia missouriensis DC. var. trichophora Engelm. & Bigelow - >>opuntia Polyacantha Var. Trichophora
- Opuntia mojavensis Engelm. - >>opuntia Phaeacantha Var. Major
- Opuntia monacantha (Willd.) Haw. - Common Pricklypear
- Opuntia monacantha Haw.
- Opuntia moniliformis (L.) Haw. ex Steud. - Tuna
- Opuntia munzii C.B. Wolf - Munz's Cholla
- Opuntia nicholii L. Benson - Navajo Bridge Pricklypear
- Opuntia nitens Small - >>opuntia Stricta Var. Dillenii
- Opuntia occidentalis Engelm. & Bigelow var. covillei (Britt. & Rose) Munz - >>opuntia Littoralis Var. Vaseyi
- Opuntia occidentalis Engelm. & Bigelow var. littoralis (Engelm.) Parish - >>opuntia Littoralis Var. Littoralis
- Opuntia occidentalis Engelm. & Bigelow var. megacarpa (Griffiths) Munz - >>opuntia Engelmannii Var. Engelmannii
- Opuntia occidentalis Engelm. & Bigelow var. piercei (Fosberg) Munz - >>opuntia Littoralis Var. Piercei
- Opuntia occidentalis Engelm. & Bigelow var. vaseyi (Coult.) Munz - >>opuntia Littoralis Var. Vaseyi
- Opuntia ochrocentra Small - >>opuntia Cubensis
- Opuntia opuntia (L.) Karst. - >>opuntia Humifusa Var. Humifusa
- Opuntia oricola Philbrick - Chaparral Pricklypear
- Opuntia P. Mill. - Pricklypear
- Opuntia parishii Orcutt - Matted Cholla
- Opuntia parryi Engelm. - >>opuntia Californica Var. Parkeri
- Opuntia parryi Engelm. var. serpentina (Engelm.) L. Benson - >>opuntia Californica Var. Parkeri
- Opuntia phaeacantha - Bastard Fig
- Opuntia phaeacantha Engelm. - Tulip Pricklypear
- Opuntia phaeacantha Engelm. var. brunnea (Engelm.) Engelm. - >>opuntia Phaeacantha Var. Major
- Opuntia phaeacantha Engelm. var. camanchica (Engelm. & Bigelow) L. Benson - Tulip Pricklypear
- Opuntia phaeacantha Engelm. var. discata (Griffiths) L. Benson & Walkington - >>opuntia Engelmannii Var. Engelmannii
- Opuntia phaeacantha Engelm. var. flavispina L. Benson - >>opuntia Engelmannii Var. Flavispina
- Opuntia phaeacantha Engelm. var. laevis (Coult.) L. Benson - Tulip Pricklypear
- Opuntia phaeacantha Engelm. var. major Engelm. - Mojave Pricklypear
- Opuntia phaeacantha Engelm. var. mojavensis (Engelm.) Fosberg - >>opuntia Phaeacantha Var. Major
- Opuntia phaeacantha Engelm. var. nigricans (Engelm.) Engelm. - >>opuntia Phaeacantha Var. Phaeacantha
- Opuntia phaeacantha Engelm. var. phaeacantha - Tulip Pricklypear
- Opuntia phaeacantha Engelm. var. piercei Fosberg - >>opuntia Littoralis Var. Piercei
- Opuntia phaeacantha Engelm. var. spinosibacca (Anthony) L. Benson - >>opuntia Spinosibacca
- Opuntia phaeacantha Engelm. var. superbospina (Griffiths) L. Benson - >>opuntia Superbospina
- Opuntia phaeacantha Engelm. var. tenuispina (Engelm. & Bigelow) Weniger - >>opuntia Macrorhiza Var. Pottsii
- Opuntia phaeacantha Engelm. var. wootonii (Griffiths) L. Benson - Wooton's Pricklypear
- Opuntia pinkavae Parfitt - Pinkava's Pricklypear
- Opuntia pisciformis Small - >>opuntia Humifusa Var. Ammophila
- Opuntia plumbea Rose - >>opuntia Macrorhiza Var. Macrorhiza
- Opuntia pollardii Britt. & Rose - >>opuntia Humifusa Var. Austrina
- Opuntia polyacantha Haw. - Plains Pricklypear
- Opuntia polyacantha Haw. var. juniperina (Britt. & Rose) L. Benson - Juniper Pricklypear
- Opuntia polyacantha Haw. var. polyacantha - Hairspine Pricklypear
- Opuntia polyacantha Haw. var. rufispina (Engelm. & Bigelow ex Engelm.) L. Benson - Hairspine Pricklypear
- Opuntia polyacantha Haw. var. trichophora (Engelm. & Bigelow) Coult. - Hairspine Pricklypear
- Opuntia pottsii Salm-Dyck - >>opuntia Macrorhiza Var. Pottsii
- Opuntia prolifera Engelm. - Coastal Cholla
- Opuntia pulchella Engelm. - Sagebrush Cholla
- Opuntia pusilla (Haw.) Nutt. - Cockspur Pricklypear
- Opuntia pygmaea (Wieg. & Backeberg) Rowley - >>opuntia Pulchella
- Opuntia rafinesquei Engelm. - >>opuntia Humifusa Var. Humifusa
- Opuntia ramosissima - Branched Pencil Cholla
- Opuntia ramosissima Engelm. - Branched Pencil Cholla
- Opuntia repens Bello - Roving Pricklypear
- Opuntia rhodantha K. Schum. - >>opuntia Erinacea Var. Utahensis
- Opuntia rhodantha K. Schum. var. spinosior Boissevain - >>opuntia Erinacea Var. Utahensis
- Opuntia riviereana Backeb.
- Opuntia robusta H.L.Wendl.
- Opuntia rosea DC.
- Opuntia rubescens Salm-Dyck ex DC. - Sour Pricklypear
- Opuntia rubrifolia Engelm. ex Coult. - >>opuntia Erinacea Var. Ursina
- Opuntia rufida Engelm. - Blind Pricklypear
- Opuntia rutila Nutt. - >>opuntia Polyacantha Var. Rufispina
- Opuntia salmiana Parm. in Pfeiff.
- Opuntia santa-rita (Griffiths & Hare) Rose - Santa Rita Pricklypear
- Opuntia schottii Engelm. - Dog Cholla
- Opuntia schottii Engelm. var. grahamii (Engelm.) L. Benson - >>opuntia Grahamii
- Opuntia schweriniana K. Schum. - >>opuntia Fragilis Var. Fragilis
- Opuntia serpentina Engelm. - >>opuntia Californica Var. Parkeri
- Opuntia spectatissima (Daston) Rowley - >>opuntia Pulchella
- Opuntia sphaerocarpa Engelm. & Bigelow - >>opuntia Polyacantha Var. Juniperina
- Opuntia sphaerocarpa Engelm. & Bigelow var. utahensis Engelm. - >>opuntia Erinacea Var. Utahensis
- Opuntia spinosior (Engelm.) Toumey - Walkingstick Cactus
- Opuntia spinosissima P. Mill. - Semaphore Pricklypear
- Opuntia spinulifera Salm-Dyck
- Opuntia stanlyi Engelm. - >>opuntia Kunzei
- Opuntia stanlyi Engelm. var. kunzei (Rose) L. Benson - >>opuntia Kunzei
- Opuntia stanlyi Engelm. var. parishii (Orcutt) L. Benson - >>opuntia Parishii
- Opuntia stanlyi Engelm. var. peeblesiana L. Benson - >>opuntia Kunzei
- Opuntia stricta (Haw.) Haw. - Erect Pricklypear
- Opuntia stricta (Haw.) Haw.
- Opuntia stricta (Haw.) Haw. var. dillenii (Ker-Gawl.) L. Benson - Erect Pricklypear
- Opuntia stricta (Haw.) Haw. var. stricta - Erect Pricklypear
- Opuntia stricta Haw. var. dillenii (Ker Gawl.) L.D.Benson
- Opuntia strigil Engelm. - Marblefruit Pricklypear
- Opuntia strigil Engelm. var. flexospina (Griffiths) L. Benson - >>opuntia Engelmannii Var. Flexospina
- Opuntia superbospina Griffiths - Kingman Pricklypear
- Opuntia tardospina Griffiths - >>opuntia Engelmannii Var. Lindheimeri
- Opuntia tenuiflora Small - >>opuntia Macrorhiza Var. Pottsii
- Opuntia tenuispina Engelm. & Bigelow - >>opuntia Macrorhiza Var. Pottsii
- Opuntia thornberi Thornb. & Bonker - >>opuntia Acanthocarpa Var. Thornberi
- Opuntia tomentosa Salm-Dyck - Woollyjoint Pricklypear
- Opuntia tortispina Engelm. & Bigelow - >>opuntia Macrorhiza Var. Macrorhiza
- Opuntia tracyi Britt. - >>opuntia Pusilla
- Opuntia treleasei Coult. - >>opuntia Basilaris Var. Treleasei
- Opuntia triacantha (Willd.) Sweet - Spanish Lady
- Opuntia trichophora (Engelm. & Bigelow) Britt. & Rose - >>opuntia Polyacantha Var. Trichophora
- Opuntia tricolor Griffiths - >>opuntia Engelmannii Var. Lindheimeri
- Opuntia tuberculosirhopalica (Wieg. & Backeberg) Rowley - >>opuntia Pulchella
- Opuntia tuna (L.) Miller - Elephantear Pricklypear
- Opuntia tuna (L.) Miller
- Opuntia tunicata (Lehm.) Link & Otto - Thistle Cholla
- Opuntia tunicata (Lehm.) Link & Otto var. davisii (Engelm. & Bigelow) L. Benson - Thistle Cholla
- Opuntia tunicata (Lehm.) Link & Otto var. tunicata - Thistle Cholla
- Opuntia tunoidea Gibbes - >>opuntia Stricta Var. Dillenii
- Opuntia turbinata Small - >>opuntia Humifusa Var. Ammophila
- Opuntia turgida Small - >>opuntia Humifusa Var. Ammophila
- Opuntia ursina A. Weber - >>opuntia Erinacea Var. Ursina
- Opuntia valida Griffiths - San Antonio Pricklypear
- Opuntia vaseyi (Coult.) Britt. & Rose - >>opuntia Littoralis Var. Vaseyi
- Opuntia versicolor Engelm. ex Coult. - Staghorn Cholla
- Opuntia violacea Engelm. - >>opuntia Macrocentra Var. Macrocentra
- Opuntia violacea Engelm. var. castetteri L. Benson - >>opuntia Macrocentra Var. Macrocentra
- Opuntia violacea Engelm. var. gosseliniana (A. Weber) L. Benson - >>opuntia Gosseliniana
- Opuntia violacea Engelm. var. macrocentra (Engelm.) L. Benson - >>opuntia Macrocentra Var. Macrocentra
- Opuntia violacea Engelm. var. santa-rita (Griffiths & Hare) L. Benson - >>opuntia Santa-rita
- Opuntia vulgaris auct. non P. Mill. - >>opuntia Monacantha
- Opuntia vulgaris Mill.
- Opuntia vulgaris P. Mill. - >>opuntia Ficus-indica
- Opuntia whipplei Engelm. & Bigelow - Whipple Cholla
- Opuntia whipplei Engelm. & Bigelow var. multigeniculata (Clokey) L. Benson - >>opuntia Multigeniculata
- Opuntia whipplei Engelm. & Bigelow var. spinosior Engelm. - >>opuntia Spinosior
- Opuntia whipplei Engelm. & Bigelow var. viridiflora (Britt. & Rose) L. Benson - >>opuntia Viridiflora
- Opuntia whitneyana E.M. Baxter - >>opuntia Basilaris Var. Basilaris
- Opuntia whitneyana E.M. Baxter var. albiflora E.M. Baxter - >>opuntia Basilaris Var. Basilaris
- Opuntia wiegandii (Backeberg) Rowley - >>opuntia Pulchella
- Opuntia wigginsii L. Benson - Wiggins' Cholla
- Opuntia wolfii (L. Benson) M.A. Baker - Wolf's Opuntia
- Opuntia woodsii Backeberg - >>opuntia Phaeacantha Var. Major
- Opuntia wootonii Griffiths - >>opuntia Phaeacantha Var. Wootonii
- Opuntia wrightiana E.M. Baxter - >>opuntia Kunzei
- Opuntia zebrina Small - >>opuntia Stricta Var. Dillenii
- Opuntia ×congesta Griffiths (pro sp.)
- Opuntia ×cubensis Britt. & Rose - Bullsuckers
- Opuntia ×curvospina Griffiths (pro sp.) - Searchlight Pricklypear
- Opuntia ×demissa Griffiths (pro sp.)
- Opuntia ×deserta Griffiths (pro sp.)
- Opuntia ×ellisiana Griffiths - Tigertongue
- Opuntia ×kelvinensis V.& K. Grant
- Opuntia ×multigeniculata Clokey (pro sp.) - Blue Diamond Cholla
- Opuntia ×neoarbuscula Griffiths (pro sp.)
- Opuntia ×occidentalis Engelm. & Bigelow (pro sp.)
- Opuntia ×spinosibacca Anthony (pro sp.)
- Opuntia ×subarmata Griffiths (pro sp.)
- Opuntia ×tetracantha Toumey (pro sp.)
- Opuntia ×viridiflora Britt. & Rose (pro sp.) - Rat-tail Cholla
- Opuntia ×vivipara Rose (pro sp.)
- Pachycereus (Berger) Britt. & Rose - Pachycereus
- Pachycereus schottii (Engelm.) D.R. Hunt - Senita Cactus
- Pachycereus thurberi (Engelm.) H. Bravo - >>stenocereus Thurberi
- Parodia concinna (Monv.) N.P. Taylor
- Parodia Speg. - Parodia
- Pediocactus bradyi L. Benson - Brady's Hedgehog Cactus
- Pediocactus Britt. & Rose - Hedgehog Cactus
- Pediocactus despainii Welsh & Goodrich - Despain's Pincushion Cactus
- Pediocactus glaucus (J.A. Purpus ex K. Schum.) Arp - >>sclerocactus Glaucus
- Pediocactus knowltonii L. Benson - Knowlton's Miniature Cactus
- Pediocactus mesae-verdae (Boissevain ex Boissevain & C. Davids.) Arp - >>sclerocactus Mesae-verdae
- Pediocactus papyracanthus (Engelm.) L. Benson - >>sclerocactus Papyracanthus
- Pediocactus paradinei B.W. Benson - Park Hedgehog Cactus
- Pediocactus peeblesianus (Croizat) L. Benson - Navajo Pincushion Cactus
- Pediocactus peeblesianus (Croizat) L. Benson var. fickeiseniae L. Benson - Navajo Pincushion Cactus
- Pediocactus peeblesianus (Croizat) L. Benson var. peeblesianus - Navajo Pincushion Cactus
- Pediocactus sileri (Engelm.) L. Benson - Siler's Pincushion Cactus
- Pediocactus simpsonii (Engelm.) Britt. & Rose - Simpson Hedgehog Cactus
- Pediocactus simpsonii (Engelm.) Britt. & Rose var. minor (Engelm.) Cockerell - Snowball Cactus
- Pediocactus simpsonii (Engelm.) Britt. & Rose var. robustior (Coult.) L. Benson - Snowball Cactus
- Pediocactus simpsonii (Engelm.) Britt. & Rose var. simpsonii - Simpson Hedgehog Cactus
- Pediocactus whipplei (Engelm. & Bigelow) Arp - >>sclerocactus Whipplei
- Pediocactus winkleri Heil - Winkler's Pincushion Cactus
- Peniocereus (Berger) Britt. & Rose - Peniocereus
- Peniocereus greggii (Engelm.) Britt. & Rose - Nightblooming Cereus
- Peniocereus greggii (Engelm.) Britt. & Rose var. greggii - Nightblooming Cereus
- Peniocereus greggii (Engelm.) Britt. & Rose var. transmontanus (Engelm.) Backeberg - Nightblooming Cereus
- Peniocereus striatus (Brandeg.) Buxbaum - Gearstem Cactus
- Pereskia aculeata Mill.
- Pereskia aculeata P. Mill. - Barbados Shrub
- Pereskia aculeata P. Mill. var. godseffiana (hort. ex Gard. Chron.) Backeberg & F.M. Knuth ex Krainz - >>pereskia Aculeata
- Pereskia grandiflora Haw.
- Pereskia P. Mill. - Pereskia
- Pereskia pereskia (L.) Karst. - >>pereskia Aculeata
- Phellosperma tetrancistra (Engelm.) Britt. & Rose - >>mammillaria Tetrancistra
- Pilocereus robinii Lem. - >>pilosocereus Robinii Var. Robinii
- Pilocereus strictus (DC.) Rumpl. - >>pilosocereus Royenii
- Pilosocereus Byles & Rowley - Tree Cactus
- Pilosocereus nobilis (Haw.) Byles & Rowley - >>pilosocereus Royenii
- Pilosocereus robinii (Lem.) Byles & Rowley - Key Tree Cactus
- Pilosocereus robinii (Lem.) Byles & Rowley var. deeringii (Small) Kartesz & Gandhi - Deering's Tree Cactus
- Pilosocereus robinii (Lem.) Byles & Rowley var. robinii - Key Tree Cactus
- Pilosocereus royenii (L.) Byles & Rowley - Royen's Tree Cactus
- Piptanthocereus peruvianus auct. non (L.) Riccob. - >>cereus Hildmannianus
- Rebutia K. Schum. - Rebutia
- Rhipsalis baccifera (J.S.Muell.) Stearn subsp. baccifera
- Rhipsalis baccifera (J.S.Muell.) Stearn subsp. erythrocarpa (K.Schum.) Barthlott
- Rhipsalis baccifera (J.S.Muell.) Stearn subsp. mauritiana (DC.) Barthlott
- Rhipsalis baccifera (Soland. ex J. Mill.) Stearn - Mistletoe Cactus
- Rhipsalis cassutha Gaertn. - >>rhipsalis Baccifera
- Rhipsalis cassytha Gaertn.
- Rhipsalis cassytha Gaertn. var. mauritiana DC.
- Rhipsalis erythrocarpa K.Schum.
- Rhipsalis Gaertn. - Rhipsalis
- Rhipsalis guineensis A.Chev.
- Rhipsalis zanzibarica A.Weber
- Schlumbergera gaertneri (Regel) Britton & Rose - >>hatiora Gaertneri
- Schlumbergera Lem. - Schlumbergera
- Schlumbergera truncata (Haw.) Moran - False Christmas Cactus
- Sclerocactus blainei Welsh & Thorne - Blaine Fishhook Cactus
- Sclerocactus brevihamatus (Engelm.) D.R. Hunt - Shorthook Fishhook Cactus
- Sclerocactus brevihamatus (Engelm.) D.R. Hunt ssp. tobuschii (W.T. Marsh.) N.P. Taylor - Shorthook Fishhook Cactus
- Sclerocactus brevispinus Heil & Martin - Shortspine Fishhook Cactus
- Sclerocactus Britt. & Rose - Fishhook Cactus
- Sclerocactus cloverae K.D. Heil & J.M. Porter ssp. brackii K.D.Heil & J.M.Porter - Brack's Cactus
- Sclerocactus cloveriae Heil & Porter - Clover's Fishhook Cactus
- Sclerocactus contortus Heil - Canyonlands Fishhook Cactus
- Sclerocactus erectocentrus (Coult.) N.P. Taylor - Redspine Fishhook Cactus
- Sclerocactus glaucus (J.A. Purpus ex K. Schum.) L. Benson - Uinta Basin Hookless Cactus
- Sclerocactus intermedius Peebles - >>sclerocactus Parviflorus Ssp. Intermedius
- Sclerocactus intertextus (Engelm.) N.P. Taylor - White Fishhook Cactus
- Sclerocactus intertextus (Engelm.) N.P. Taylor var. dasyacanthus (Engelm.) N.P. Taylor - White Fishhook Cactus
- Sclerocactus intertextus (Engelm.) N.P. Taylor var. intertextus - White Fishhook Cactus
- Sclerocactus johnsonii (Parry ex Engelm.) N.P. Taylor - Johnson's Fishhook Cactus
- Sclerocactus mariposensis (Hester) N.P. Taylor - Lloyd's Fishhook Cactus
- Sclerocactus mesae-verdae (Boissevain ex Boissevain & C. Davids.) L. Benson - Mesa Verde Fishhook Cactus
- Sclerocactus nyensis F. Hochstatter - Nye County Fishhook Cactus
- Sclerocactus papyracanthus (Engelm.) N.P. Taylor - Paperspine Fishhook Cactus
- Sclerocactus parviflorus Clover & Jotter - Smallflower Fishhook Cactus
- Sclerocactus parviflorus Clover & Jotter ssp. intermedius (Peebles) Heil & Porter - Intermediate Fishhook Cactus
- Sclerocactus parviflorus Clover & Jotter ssp. parviflorus - Smallflower Fishhook Cactus
- Sclerocactus parviflorus Clover & Jotter var. blessingiae W.H. Earle - >>sclerocactus Whipplei
- Sclerocactus parviflorus Clover & Jotter var. intermedius (Peebles) Woodruff & L. Benson - >>sclerocactus Parviflorus Ssp. Intermedius
- Sclerocactus polyancistrus (Engelm. & Bigelow) Britt. & Rose - Redspined Fishhook Cactus
- Sclerocactus pubispinus (Engelm.) L. Benson - Great Basin Fishhook Cactus
- Sclerocactus pubispinus (Engelm.) L. Benson var. sileri L. Benson - >>sclerocactus Spinosior
- Sclerocactus pubispinus (Engelm.) L. Benson var. spinosior (Engelm.) Welsh - >>sclerocactus Spinosior
- Sclerocactus scheeri (Salm-Dyck) N.P. Taylor - Scheer's Fishhook Cactus
- Sclerocactus schlesseri Heil & Welsh - Schlesser's Fishhook Cactus
- Sclerocactus sileri (L. Benson) Heil & J.M. Porter - >>sclerocactus Spinosior
- Sclerocactus spinosior (Engelm.) Woodruff & L. Benson - Desert Valley Fishhook Cactus
- Sclerocactus terrae-canyonae Heil - Longspine Fishhook Cactus
- Sclerocactus uncinatus (Galeotti) N.P. Taylor - Chihuahuan Fishhook Cactus
- Sclerocactus uncinatus (Galeotti) N.P. Taylor var. wrightii (Engelm.) N.P. Taylor - Chihuahuan Fishhook Cactus
- Sclerocactus warnockii (L. Benson) N.P. Taylor - Warnock's Fishhook Cactus
- Sclerocactus whipplei (Engelm. & Bigelow) Britt. & Rose - Whipple's Fishhook Cactus
- Sclerocactus whipplei (Engelm. & Bigelow) Britt. & Rose var. glaucus (J.A. Purpus ex K. Schum.) Welsh - >>sclerocactus Glaucus
- Sclerocactus whipplei (Engelm. & Bigelow) Britt. & Rose var. heilii Castetter, Pierce & Schwerin - >>sclerocactus Cloveriae
- Sclerocactus whipplei (Engelm. & Bigelow) Britt. & Rose var. intermedius (Peebles) L. Benson - >>sclerocactus Parviflorus Ssp. Intermedius
- Sclerocactus whipplei (Engelm. & Bigelow) Britt. & Rose var. reevsii Castetter, Pierce & Schwerin - >>sclerocactus Cloveriae
- Sclerocactus whipplei (Engelm. & Bigelow) Britt. & Rose var. roseus (Clover) L. Benson - >>sclerocactus Whipplei
- Sclerocactus whipplei (Engelm. & Bigelow) Britt. & Rose var. spinosior (Engelm.) Boissevain - >>sclerocactus Spinosior
- Sclerocactus wrightiae L. Benson - Wright's Fishhook Cactus
- Selenicereus (Berger) Britt. & Rose - Moonlight Cactus
- Selenicereus coniflorus (Weingart) Britt. & Rose - Coneflower Moonlight Cactus
- Selenicereus grandiflorus (L.) Britt. & Rose - Queen Of The Night
- Selenicereus pteranthus (Link ex A. Dietr.) Britt. & Rose - Princess Of The Night
- Selenicereus spinulosus (DC.) Britt. & Rose - Vinelike Moonlight Cactus
- Stenocereus (Berger) Riccob. - Stenocereus
- Stenocereus fimbriatus (Lam.) Lourteig - Spanish Stenocereus
- Stenocereus hystrix (Haw.) Buxbaum - >>stenocereus Fimbriatus
- Stenocereus peruvianus auct. non (P. Mill.) Kiesling - >>cereus Hildmannianus
- Stenocereus thurberi (Engelm.) Buxbaum - Organpipe Cactus
- Thelocactus (K. Schum.) Britt. & Rose - Thelocactus
- Thelocactus bicolor (Galeotti ex Pfeiffer) Britt. & Rose - Glory Of Texas
- Thelocactus bicolor (Galeotti ex Pfeiffer) Britt. & Rose var. bicolor - Glory Of Texas
- Thelocactus bicolor (Galeotti ex Pfeiffer) Britt. & Rose var. flavidispinus Backeberg - Glory Of Texas
- Thelocactus bicolor (Galeotti ex Pfeiffer) Britt. & Rose var. schottii (Engelm.) Krainz - >>thelocactus Bicolor Var. Bicolor
- Thelocactus setispinus (Engelm.) E.F. Anderson - Miniature Barrel Cactus
- Toumeya papyracantha (Engelm.) Britt. & Rose - >>sclerocactus Papyracanthus
- Trichocereus (A. Berger) Riccob. - Trichocereus
- Trichocereus auricolor Backeb.
- Trichocereus callianthus F. Ritter
- Trichocereus candicans (Salm-Dyck) Britton & Rose - >>echinopsis Candicans
- Trichocereus grandiflorus Backeb.
- Trichocereus pasacanus (F.A.C. Weber) Friedrich & G.D. Rowley - >>echinopsis Pasacana
- Trichocereus peruvianus Britton & Rose
- Trichocereus spachianus (Lem.) Riccob.
- Trichocereus uyupampensis Backeb.
- Turbinicarpus Buxbaum & Backeberg - Top Cactus
- Turbinicarpus gautii (L. Benson) A.D. Zimmerman - Top Cactus
- Wigginsia D.M. Porter
- Wigginsia fricii (Arech.) D.M. Porter
- Wilcoxia diguetii (A. Weber) Peebles - >>peniocereus Striatus
- Wilcoxia poselgeri (Lem.) Britt. & Rose - >>echinocereus Poselgeri
- Wilcoxia striata (Brandeg.) Britt. & Rose - >>peniocereus Striatus
- Zygocactus truncatus (Haw.) K. Schum. - >>schlumbergera Truncata