Overview of the Pinaceae plant family
The Pinaceae family is a group of trees commonly known as the pine family. This family includes about 250 species of conifers, distributed throughout the world, although predominantly in the Northern Hemisphere. They are typically evergreen trees, with needle-like leaves arranged in clusters, and they produce cones as their reproductive structures.
Taxonomic details
The Pinaceae family is included in the Pinophyta division, which contains all the conifers. The family is divided into seven genera: Pinus, Picea, Abies, Larix, Pseudotsuga, Cedrus, and Keteleeria. The genus Pinus is the largest in the family and includes the well-known species of pine trees. The Pinaceae family is also subclassified into three subfamilies: Pinoideae, Laricoideae, and Abietoideae, based on the characteristics of their cones and needles.
Unique characteristics
The Pinaceae family is characterized by their cones, which are usually woody and have scales that protect the seeds. The cones are also the reproductive structures of the family, with male and female cones found on the same tree. The needles of Pinaceae trees are also unique, with a variety of shapes and sizes depending on the species. For example, pine needles are slender and often arranged in bundles, while spruce needles are short and pointed, and fir needles are usually flat and rounded.
Another unique feature of Pinaceae trees is their resin, which is produced by specialized cells and can be used for a variety of purposes, including as a natural preservative and adhesive. Some species of the family, such as the Western Red Cedar, have bark that can be easily peeled off and used for making baskets and other objects.
Distribution of the Pinaceae Family
The Pinaceae family, commonly known as the pine family, is widespread in the Northern Hemisphere, covering the temperate and boreal regions of North America, Europe, and Asia. The family has representatives in both the Old and New World, with differing species found in each region.
The family has more than 250 species and 11 genera worldwide, with some of the most important being Pinus, Picea, Abies, and Tsuga. These genera have different geographic distributions and can be found in various countries or regions worldwide.
In North America, the pine family is mostly found in the United States, Canada, and Mexico. The family is much less diverse in Europe, with a few species found in the mountains of Southern Europe. In Asia, the family is prevalent in Russia, Japan, China, and other northeastern regions, where bountiful forests and taiga ecosystems occur.
Habitats of the Pinaceae Family
The Pinaceae family is well adapted to cold and dry climates, growing under various moisture and light conditions in boreal, temperate, and montane forests. Some species can survive in alpine and tundra ecosystems. They have adapted to these extreme environments by developing thick bark, shallow roots, and needle-like leaves to minimize water loss and withstand harsh weather conditions.
Most members of the family grow in coniferous forests, on acidic, well-drained soils. The habitats of the family members are dominated by mixed forests of evergreen and deciduous plants, shrubs, and other conifer species. For example, Picea species can typically be found growing in mixed forests along with Betula, Populus tremuloides, and Acer species. On the other hand, Pinus species are predominantly found in mixed forests with oak species, junipers, and grasses.
The Pinaceae family prefers open spaces, places with moderate sunlight, and well-drained soils. Some species need specific soil requirements such as clay or loam. Larger species like Sequoiadendron giganteum thrive best near small streams and on slopes in the Western United States.
In conclusion, the Pinaceae family is widely distributed worldwide, occupying critical roles in the ecosystem. These plants are well suited for extreme environments, and their habitats are prevalent in temperate, boreal, and montane forests and taiga ecosystems.Introduction
The Pinaceae family, also known as the pine family, is a group of coniferous plants that includes some of the world's most commercially important timber trees. This family is widely distributed, with members found throughout much of the world, including cold, temperate, and tropical regions.Morphology and Structure
Plants in the Pinaceae family are typically large and long-lived, often growing to heights of 50 meters or more. They are characterized by their cone-shaped or columnar growth habit, with a single stem and a straight trunk. The bark is usually thick, rough, and heavily furrowed, providing protection against fire and other environmental stresses. The leaves of Pinaceae plants are typically needle-shaped, with the edges rolled under to form a groove that helps conserve moisture. The needles are borne in clusters, or fascicles, with the number of needles per fascicle varying depending on the species. For example, pine trees typically have two to five needles per fascicle, while firs and spruces have needles arranged singly on the stem. The roots of Pinaceae plants are typically shallow and wide-spreading, allowing them to absorb as much moisture as possible from the soil and helping to anchor the plant in place.Anatomical Features and Adaptations
One key adaptation of Pinaceae plants is their ability to survive in harsh, cold climates. They have developed thick bark, dense wood, and needle-like leaves that help them conserve water and resist cold temperatures. The needles of Pinaceae plants are also covered with a waxy coating that helps prevent moisture loss. Additionally, many species in this family produce resin, a sticky substance that can deter herbivores and protect against herbivory and infections.Variations in Leaf Shapes and Flower Structures
While the needle-like leaves are a common feature of Pinaceae plants, there is some variation in leaf shape among different species. For example, the needles of the bristlecone pine are relatively short and stout, while those of the eastern white pine are longer and more slender. Pinaceae plants are also characterized by their reproductive structures, which typically take the form of cones. However, there is variation in cone size, shape, and color among different species. The cones of spruces, for example, tend to be much longer and thinner than those of pines, which are typically shorter and thicker.Conclusion
The Pinaceae family is a diverse group of conifers that include some of the world's most commercially valuable and ecologically important trees. Despite their many differences, all Pinaceae plants share certain key anatomical features and adaptations that allow them to thrive in a variety of environmental conditions. Understanding the morphology, structure, and adaptations of this family can provide valuable insights into their ecology, evolution, and importance to human societies.Reproductive Strategies in the Pinaceae Family
Plants from the Pinaceae family use several reproductive strategies to ensure the survival and dispersal of their offspring. These strategies involve the production of cones, flowers, and seeds, as well as the mechanisms of pollination and seed dispersal.
Mechanisms of Reproduction within the Family
The Pinaceae family is known for its unique method of reproduction, which involves the production of cones. These cones contain male or female reproductive organs and are typically found on separate branches of the tree. The male cones produce pollen that is carried by the wind to the female cones, where fertilization occurs.
Another specialized mechanism of reproduction within the family is the production of strobili, which are cone-like structures that contain both male and female reproductive organs. This method of reproduction is used by some species of Pinaceae, such as the larch and the bald cypress.
Flowering Patterns and Pollination Strategies
Pinaceae plants do not produce flowers, but they do produce cones that serve a similar purpose. The male cones produce pollen that is carried by the wind to the female cones, where fertilization occurs. The timing of cone production and the release of pollen are often synchronized within a single tree or across multiple trees of the same species.
Pinaceae plants do not rely on pollinators such as bees or butterflies, as their pollination strategy involves the wind. This means that pollination is often less efficient than in plants that rely on insect pollinators.
Seed Dispersal Methods and Adaptations
The seeds of Pinaceae plants are typically contained within the cones and are dispersed either by the wind or by animals. Some species, such as the lodgepole pine, have cones that are sealed with resin and require high temperatures to open and release their seeds. This adaptation ensures that seeds are only released under favorable conditions, increasing the chances of successful germination.
Other adaptations that Pinaceae plants have developed to aid in seed dispersal include winged seeds that can be carried by the wind over long distances and seeds with hooks or barbs that can attach to the fur or feathers of animals and be carried to new locations. These adaptations increase the chances that seeds will be dispersed to favorable locations where they can germinate and grow into new trees.
Economic Importance of the Pinaceae Family
The Pinaceae family is economically significant because of its many uses in various industries. The wood of pine trees is commonly used in construction, furniture making, paper products, and shipbuilding. Some species within this family are also used for their medicinal properties, such as the needles of certain pine trees, which can be made into a tea that has been used to treat coughs, colds, and other respiratory ailments.
In the culinary world, pine nuts obtained from the cones of some species, such as the stone pine, are a popular ingredient in many cuisines globally. These nuts are nutritious and savory and are used to flavor pesto sauces, salads, and other dishes.
Pinene is an essential oil derived from pine trees, which has industrial uses. This oil is commonly used as a solvent in the manufacturing of paints, adhesives, and cleaning products.
Ecological Importance of the Pinaceae Family
Pine trees play a crucial ecological role in many ecosystems. They are often pioneer species that colonize disturbed areas and improve soil quality. The needles and branches of pine trees also provide habitat and shelter to many wildlife species such as birds, squirrels, and insects.
Furthermore, pine forests help regulate the water cycle in an ecosystem by intercepting and storing precipitation and releasing water gradually through transpiration. Pine trees are also efficient at sequestering carbon from the atmosphere, helping to mitigate the effects of climate change.
Conservation Status and Efforts for Conservation
Many species within the Pinaceae family are facing threats such as habitat loss, deforestation, and climate change. Some species are also susceptible to invasive species and pests such as the pine beetle. Efforts to conserve species in this family involve measures such as forest restoration, fire prevention, and the establishment of protected areas.
Several organizations are also working towards plant conservation and management. The International Union for Conservation of Nature (IUCN) maintains a database of threatened plant species globally, which includes some members of the Pinaceae family.
Conservation efforts also involve planting pine trees in degraded areas and monitoring emerging threats to these species. These efforts aim to preserve the ecological importance of the Pinaceae family and ensure its long-term sustainability and usefulness.
Featured plants from the Pinaceae family
More plants from the Pinaceae family
- Abies alba - Silver Fir; Abeto; Abeto Bianco; Beyaz Koknar; Edeltanne; European Silver Fir; Gewone Zilverspar; Zilver Spar
- Abies amabilis - Red Fir; Pacific Silver Fir
- Abies amabilis (Dougl. ex Loud.) Dougl. ex Forbes - Pacific Silver Fir
- Abies arizonica Merriam - >>abies Lasiocarpa Var. Arizonica
- Abies balsamea - Balsam Fir; American Silver Fir; Balm Of Gilead Fir; Balm Of Gilead Fir (europ; Balsam Fir; Balsam,canada; Canada Balsam
- Abies balsamea (L.) P. Mill. ssp. lasiocarpa (Hook.) Boivin - >>abies Lasiocarpa Var. Lasiocarpa
- Abies balsamea (L.) P. Mill. var. fallax (Engelm.) Boivin - >>abies Lasiocarpa Var. Lasiocarpa
- Abies balsamea (L.) P. Mill. var. phanerolepis Fern. - >>abies Phanerolepis
- Abies bifolia A. Murr. - >>abies Lasiocarpa Var. Lasiocarpa
- Abies bracteata (D. Don) D. Don ex Poit. - Bristlecone Fir
- Abies cephalonica - Grecian Fir
- Abies concolor - Colorado Fir; Colorado Fir
- Abies concolor (Gord. & Glend.) Lindl. ex Hildebr. - White Fir
- Abies concolor (Gord. & Glend.) Lindl. ex Hildebr. var. lowiana (Gord. & Glend.) Lemmon - White Fir
- Abies delavayi
- Abies fraseri - She Balsam; Fraser Fir; Fraser's Fir
- Abies grandis - Grand Fir; Grand Fir; Reuzenzilverspar
- Abies grandis (Dougl. ex D. Don) Lindl. - Grand Fir
- Abies grandis (Dougl. ex D. Don) Lindl. var. idahoensis Silba - Grand Fir
- Abies homolepis Sieb. and Zucc.
- Abies lasiocarpa - Subalpine Fir; Alpine Fir; Rocky Mountain Alpine Fir; Subalpine Fir
- Abies lasiocarpa (Hook.) Nutt. - Subalpine Fir
- Abies lasiocarpa (Hook.) Nutt. var. arizonica (Merriam) Lemmon - Corkbark Fir
- Abies lasiocarpa (Hook.) Nutt. var. lasiocarpa - Subalpine Fir
- Abies lowiana (Gord. & Glend.) A. Murr. - >>abies Concolor Var. Lowiana
- Abies magnifica - Californian Red Fir; California Red Fir; Shasta Red Fir
- Abies magnifica A. Murr. - California Red Fir
- Abies magnifica A. Murr. var. shastensis Lemmon - >>abies Shastensis
- Abies mariesii
- Abies nobilis (Dougl. ex D. Don) Lindl. - >>abies Procera
- Abies nordmanniana - Caucasian Fir; Kaukasische Zilverspar
- Abies P. Mill. - Fir
- Abies pindrow - West Himalayan Fir
- Abies procera - Noble Fir
- Abies recurvata
- Abies religiosa - Sacred Fir
- Abies sachalinensis
- Abies sibirica - Siberian Fir; Siberian Fir
- Abies spectabilis - Himalayan Fir
- Abies squamata - Flaky Fir
- Abies subalpina Engelmann - >>abies Lasiocarpa Var. Lasiocarpa
- Abies veitchii - Veitch Fir; Japanse Zilverspar
- Abies veitchii sikokiana - Japanse Zilverspar
- Abies venusta (Dougl.) K. Koch - >>abies Bracteata
- Abies ×phanerolepis (Fern.) Liu
- Abies ×shastensis (Lemmon) Lemmon - Shasta Red Fir
- Cedrus deodara - Deodar
- Cedrus Trew - Cedar
- Keteleeria Carrière - Keteleeria
- Keteleeria davidiana
- Keteleeria evelyniana Mast. - Evelyn Keteleeria
- Larix alaskensis W. Wight - >>larix Laricina
- Larix decidua - Larch
- Larix kaempferi - Japanese Larch
- Larix laricina - Tamarack
- Larix laricina (Du Roi) K. Koch var. alaskensis (W. Wight) Raup - >>larix Laricina
- Larix lyallii - Sub-alpine Larch
- Larix lyallii Parl. - Subalpine Larch
- Larix occidentalis - Western Larch
- Larix occidentalis Nutt. - Western Larch
- Larix P. Mill. - Larch
- Larix potaninii - Larch
- Larix sibirica - Siberian Larch
- Larix sibirica Ledeb. - Siberian Larch
- Larix x marschlinsii - Dunkeld Hybrid Larch
- Picea A. Dietr. - Spruce
- Picea abies - Norway Spruce
- Picea asperata - Chinese Spruce
- Picea australis Small - >>picea Rubens
- Picea brachytyla - Sargent Spruce
- Picea breweriana - Weeping Spruce
- Picea canadensis (P. Mill.) B.S.P. - >>picea Glauca
- Picea engelmannii - Mountain Spruce
- Picea excelsa (Lamb.) Link - >>picea Abies
- Picea glauca - White Spruce
- Picea glauca (Moench) Voss ssp. engelmannii (Parry ex Engelm.) T.M.C. Taylor - >>picea Engelmannii
- Picea glauca (Moench) Voss var. albertiana (S. Br.) Sarg. - >>picea Glauca
- Picea glauca (Moench) Voss var. densata Bailey - >>picea Glauca
- Picea glauca (Moench) Voss var. engelmannii (Parry ex Engelm.) Boivin - >>picea Engelmannii
- Picea glauca (Moench) Voss var. porsildii Raup - >>picea Glauca
- Picea glehnii - Sakhalin Spruce
- Picea mariana - Black Spruce
- Picea orientalis - Caucasian Spruce
- Picea pungens - Blue Spruce
- Picea pungens Engelm. - Blue Spruce
- Picea purpurea - Purple-coned Spruce
- Picea rubens - Red Spruce
- Picea rubens Sarg. - Red Spruce
- Picea sitchensis - Sitka Spruce
- Picea sitchensis (Bong.) Carr. - Sitka Spruce
- Picea smithiana - Morinda Spruce
- Picea smithiana (Wall.) Boiss. - Morinda Spruce
- Picea ×lutzii Little
- Pinus albicaulis - White-bark Pine
- Pinus albicaulis Engelm. - Whitebark Pine
- Pinus apacheca Lemmon - >>pinus Engelmannii
- Pinus aristata - Bristle-cone Pine
- Pinus aristata Engelm. var. longaeva (D.K. Bailey) Little - >>pinus Longaeva
- Pinus arizonica Engelm. - Arizona Pine
- Pinus arizonica Engelm. var. arizonica - Arizona Pine
- Pinus arizonica Engelm. var. stormiae Martinez - Arizona Pine
- Pinus armandii - Chinese White Pine
- Pinus attenuata Lemmon - Knobcone Pine
- Pinus australis Michx. f. - >>pinus Palustris
- Pinus ayacahuite - Mexican White Pine
- Pinus ayacahuite C.A. Ehrenb. - >>pinus Strobiformis
- Pinus balfouriana Grev. & Balf. - Foxtail Pine
- Pinus balfouriana Grev. & Balf. ssp. austrina R.J. & J.D. Mastrogiuseppe - Foxtail Pine
- Pinus balfouriana Grev. & Balf. ssp. balfouriana - Foxtail Pine
- Pinus balsamea L. - >>abies Balsamea
- Pinus banksiana - Jack Pine
- Pinus beardsleyi A. Murr. - >>pinus Ponderosa Var. Ponderosa
- Pinus benthamiana Hartw. - >>pinus Ponderosa Var. Ponderosa
- Pinus brachyptera Engelm. - >>pinus Ponderosa Var. Ponderosa
- Pinus brutia Tenore - Pine
- Pinus bungeana - Lace-bark Pine
- Pinus californiarum
- Pinus californiarum D.K. Bailey - California Pine
- Pinus canariensis C. Smith - Canary Island Pine
- Pinus caribaea sensu Small, non Morelet - >>pinus Elliottii Var. Elliottii
- Pinus cembra - Swiss Stone Pine
- Pinus cembra sibirica - Siberian Pine
- Pinus cembroides orizabensis - Mexican Pine Nut
- Pinus cembroides Zucc. - Mexican Pinyon
- Pinus cembroides Zucc. var. bicolor Little - >>pinus Discolor
- Pinus cembroides Zucc. var. edulis (Engelm.) Voss - >>pinus Edulis
- Pinus cembroides Zucc. var. remota Little - >>pinus Remota
- Pinus chihuahuana Engelm. - >>pinus Leiophylla Var. Chihuahuana
- Pinus clausa (Chapman ex Engelm.) Vasey ex Sarg. - Sand Pine
- Pinus clausa (Chapman ex Engelm.) Vasey ex Sarg. ssp. immuginata (Ward) E. Murr. - >>pinus Clausa
- Pinus clausa (Chapman ex Engelm.) Vasey ex Sarg. var. immuginata Ward - >>pinus Clausa
- Pinus contorta Dougl. ex Loud. - Lodgepole Pine
- Pinus contorta Dougl. ex Loud. ssp. bolanderi (Parl.) Critchfield - >>pinus Contorta Var. Bolanderi
- Pinus contorta Dougl. ex Loud. ssp. latifolia (Engelm. ex S. Wats.) Critchfield - >>pinus Contorta Var. Latifolia
- Pinus contorta Dougl. ex Loud. ssp. murrayana (Grev. & Balf.) Critchfield - >>pinus Contorta Var. Murrayana
- Pinus contorta Dougl. ex Loud. var. bolanderi (Parl.) Vasey - Bolander Beach Pine
- Pinus contorta Dougl. ex Loud. var. contorta - Lodgepole Pine
- Pinus contorta Dougl. ex Loud. var. latifolia Engelm. ex S. Wats. - Tall Lodgepole Pine
- Pinus contorta Dougl. ex Loud. var. murrayana (Grev. & Balf.) Engelm. - Murray Lodgepole Pine
- Pinus contorta latifolia - Lodgepole Pine
- Pinus coulteri - Big-cone Pine
- Pinus coulteri D. Don - Coulter Pine
- Pinus culminicola - Cerro Potosi Pinyon
- Pinus culminicola Andr. & Beam. var. discolor (D.K. Bailey & Hawksworth) Silba - >>pinus Discolor
- Pinus densa (Little & Dorman) Gaussen - >>pinus Elliottii Var. Densa
- Pinus discolor
- Pinus discolor D.K. Bailey & Hawksworth - Border Pinyon
- Pinus divaricata (Ait.) Dum.-Cours. - >>pinus Banksiana
- Pinus divaricata (Ait.) Dum.-Cours. var. hendersonii (Lemmon) Boivin - >>pinus Contorta Var. Latifolia
- Pinus divaricata (Ait.) Dum.-Cours. var. latifolia (Engelm. ex S. Wats.) Boivin - >>pinus Contorta Var. Latifolia
- Pinus echinata P. Mill. - Shortleaf Pine
- Pinus edulis - Rocky Mountain Piñon
- Pinus edulis Engelm. - Twoneedle Pinyon
- Pinus edulis Engelm. var. fallax Little - >>pinus Monophylla Var. Fallax
- Pinus elliottii Engelm. - Slash Pine
- Pinus elliottii Engelm. var. austrokeyensis Silba - Key Pine
- Pinus elliottii Engelm. var. densa Little & Dorman - Florida Slash Pine
- Pinus elliottii Engelm. var. elliottii - Honduras Pine
- Pinus engelmannii Carr. - Apache Pine
- Pinus flexilis James var. reflexa Engelm. - >>pinus Strobiformis
- Pinus fraseri Pursh - >>abies Fraseri
- Pinus gerardiana - Chilghoza Pine
- Pinus glabra Walt. - Spruce Pine
- Pinus greggii Engelm. ex Parl.
- Pinus halepensis - Aleppo Pine
- Pinus halepensis P. Mill. - Aleppo Pine
- Pinus heterophylla (Ell.) Sudworth - >>pinus Elliottii Var. Elliottii
- Pinus jeffreyi - Jeffrey Pine
- Pinus johannis
- Pinus johannis M.F. Robert - Johannis Pine
- Pinus juarezensis Lanner - >>pinus Quadrifolia
- Pinus L. - Pine
- Pinus lambertiana - Sugar Pine
- Pinus lambertiana Dougl. - Sugar Pine
- Pinus latifolia Sarg. - >>pinus Engelmannii
- Pinus leiophylla - Smooth-leaf Pine
- Pinus leiophylla Schiede & Deppe - Chihuahuan Pine
- Pinus leiophylla Schiede & Deppe var. chihuahuana (Engelm.) Shaw - Chihuahuan Pine
- Pinus longaeva D.K. Bailey - Great Basin Bristlecone Pine
- Pinus maximartinezii Rzed. - Maxipiñon
- Pinus merkusii Junghuhn & Vriese ex Vriese - Merkus Pine
- Pinus monophylla - Single Leaf Piñon
- Pinus monophylla Torr. & Frém. - Singleleaf Pinyon
- Pinus monophylla Torr. & Frém. var. californiarum (Bailey) Silba - >>pinus Californiarum
- Pinus monophylla Torr. & Frém. var. fallax (Little) Silba - Singleleaf Pinyon
- Pinus monophylla Torr. & Frém. var. monophylla - Singleleaf Pinyon
- Pinus montana Miller - >>pinus Mugo
- Pinus monticola - Western White Pine
- Pinus monticola Dougl. ex D. Don - Western White Pine
- Pinus muricata - Bishop's Pine
- Pinus muricata D. Don - Bishop Pine
- Pinus muricata D. Don var. borealis D.I. Axelrod - Bishop Pine
- Pinus muricata D. Don var. muricata - Bishop Pine
- Pinus muricata D. Don var. remorata (Mason) Silba - Bishop Pine
- Pinus muricata D. Don var. stantonii D.I. Axelrod - Bishop Pine
- Pinus murrayana Grev. & Balf. - >>pinus Contorta Var. Murrayana
- Pinus nigra - Austrian Pine
- Pinus nigra Arnold var. austriaca (Hoess) Aschers. & Graebn. - >>pinus Nigra
- Pinus nigra laricio - Corsican Pine
- Pinus palustris - Pitch Pine
- Pinus palustris P. Mill. - Longleaf Pine
- Pinus patula - Mexican Weeping Pine
- Pinus patula Schiede ex Schltdl. & Cham. - Mexican Weeping Pine
- Pinus pinaster - Maritime Pine
- Pinus pinaster Soland., non Ait. - Maritime Pine
- Pinus pinea - Italian Stone Pine
- Pinus pinea L. - Italian Stone Pine
- Pinus ponderosa - Ponderosa Pine
- Pinus ponderosa P.& C. Lawson - Ponderosa Pine
- Pinus ponderosa P.& C. Lawson ssp. arizonica (Engelm.) E. Murr. - >>pinus Arizonica Var. Arizonica
- Pinus ponderosa P.& C. Lawson ssp. coulteri (D. Don) E. Murr. - >>pinus Coulteri
- Pinus ponderosa P.& C. Lawson ssp. jeffreyi (Grev. & Balf.) E. Murr. - >>pinus Jeffreyi
- Pinus ponderosa P.& C. Lawson ssp. scopulorum (Engelm.) E. Murr. - >>pinus Ponderosa Var. Scopulorum
- Pinus ponderosa P.& C. Lawson ssp. washoensis (Mason & Stockwell) E. Murr. - >>pinus Washoensis
- Pinus ponderosa P.& C. Lawson var. arizonica (Engelm.) Shaw - >>pinus Arizonica Var. Arizonica
- Pinus ponderosa P.& C. Lawson var. scopulorum Engelm. - Ponderosa Pine
- Pinus pungens Lamb. - Table Mountain Pine
- Pinus quadrifolia - Parry Piñon
- Pinus quadrifolia Parl. ex Sudworth - Parry Pinyon
- Pinus radiata - Monterey Pine
- Pinus radiata D. Don - Monterey Pine
- Pinus radiata D. Don var. binata auct. non (S. Wats.) Lemmon - >>pinus Radiata
- Pinus reflexa (Engelm.) Engelm. - >>pinus Strobiformis
- Pinus remorata Mason - >>pinus Muricata Var. Remorata
- Pinus remota - Paper-shell Piñon
- Pinus remota (Little) D.K. Bailey & Hawksworth - Papershell Pinyon
- Pinus resinosa - Red Pine
- Pinus rigida - Northern Pitch Pine
- Pinus rigida P. Mill. - Pitch Pine
- Pinus rigida P. Mill. ssp. serotina (Michx.) Clausen - >>pinus Serotina
- Pinus roxburghii - Chir Pine
- Pinus sabiniana - Digger Pine
- Pinus sabiniana Dougl. ex Dougl. - California Foothill Pine
- Pinus serotina - Pond Pine
- Pinus serotina Michx. - Pond Pine
- Pinus strobiformis - Southwestern White Pine
- Pinus strobus - White Pine
- Pinus strobus L. var. monticola (Dougl. ex D. Don) Nutt. - >>pinus Monticola
- Pinus sylvestris - Scot's Pine
- Pinus tabuliformis - Chinese Red Pine
- Pinus taeda - Loblolly Pine
- Pinus thunbergii - Japanese Black Pine
- Pinus thunbergii Parl. - >>pinus Thunbergiana
- Pinus torreyana - Soledad Pine
- Pinus torreyana Parry ex Carr. - Torrey Pine
- Pinus torreyana Parry ex Carr. ssp. insularis Haller - >>pinus Torreyana Var. Insularis
- Pinus torreyana Parry ex Carr. var. insularis (Haller) Siba - Santa Cruz Island Torrey Pine
- Pinus torreyana Parry ex Carr. var. torreyana - Torrey Pine
- Pinus veitchii
- Pinus virginiana - Scrub Pine
- Pinus wallichiana A.B. Jacks. - Bhutan Pine
- Pinus washoensis Mason & Stockwell - Washoe Pine
- Pinus ×attenuradiata Stockwell & Righter
- Pinus ×sondereggeri H.H. Chapman
- Pseudolarix amabilis - Golden Larch
- Pseudolarix kaempferi (Lamb.) Gordon - Japanese Larch
- Pseudotsuga Carr. - Douglas-fir
- Pseudotsuga flahaultii Flous - >>pseudotsuga Menziesii Var. Glauca
- Pseudotsuga macrocarpa (Vasey) Mayr - Bigcone Douglas-fir
- Pseudotsuga menziesii - Douglas Fir
- Pseudotsuga menziesii (Mirbel) Franco - Douglas-fir
- Pseudotsuga menziesii (Mirbel) Franco var. flahaultii (Flous) Silba - >>pseudotsuga Menziesii Var. Glauca
- Pseudotsuga menziesii (Mirbel) Franco var. glauca (Beissn.) Franco - Rocky Mountain Douglas-fir
- Pseudotsuga mucronata (Raf.) Sudw. - >>pseudotsuga Menziesii
- Pseudotsuga taxifolia (Lamb.) Britt. - >>pseudotsuga Menziesii Var. Menziesii
- Pseudotsuga taxifolia (Lamb.) Britt. var. glauca (Beissn.) Sudworth - >>pseudotsuga Menziesii Var. Glauca
- Strobus strobus (L.) Small - >>pinus Strobus
- Tsuga canadensis (L.) Carr. - Eastern Hemlock
- Tsuga caroliniana - Carolina Hemlock
- Tsuga Carr. - Hemlock
- Tsuga chinensis - Chinese Hemlock
- Tsuga heterophylla - Western Hemlock
- Tsuga mertensiana - Mountain Hemlock
- Tsuga ×jeffreyi (Henry) Henry