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Purshia
''Purshia'' (bitterbrush or cliff-rose) is a small genus of 5–8 species of flowering plants in the family Rosaceae which are native to western North America. Description ''Purshia'' species form deciduous or evergreen shrubs, typically reaching tall. The leaves are long, deeply three- to five-lobed, with revolute margins. The flowers are 1–2 cm in diameter, with five white to pale yellow or pink petals and yellow stamens. The fruit is a cluster of dry, slender, leathery achenes which are 2–6 cm long. The roots have nodules that host nitrogen-fixing ''Frankia'' bacterium. Taxonomy Taxonomic history The genus was originally placed in the subfamily Rosoideae. In the past, the evergreen species were treated separately in the genus ''Cowania''; this genus is still accepted by some botanists. Modern classification The classification of ''Purshia'' within the family Rosaceae has been unclear. It is now placed in the subfamily Dryadoideae. Species ''Purshia'' compr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Purshia Plicata
''Purshia'' (bitterbrush or cliff-rose) is a small genus of 5–8 species of flowering plants in the family Rosaceae which are native to western North America. Description ''Purshia'' species form deciduous or evergreen shrubs, typically reaching tall. The leaves are long, deeply three- to five-lobed, with revolute margins. The flowers are 1–2 cm in diameter, with five white to pale yellow or pink petals and yellow stamens. The fruit is a cluster of dry, slender, leathery achenes which are 2–6 cm long. The roots have nodules that host nitrogen-fixing '' Frankia'' bacterium. Taxonomy Taxonomic history The genus was originally placed in the subfamily Rosoideae. In the past, the evergreen species were treated separately in the genus ''Cowania''; this genus is still accepted by some botanists. Modern classification The classification of ''Purshia'' within the family Rosaceae has been unclear. It is now placed in the subfamily Dryadoideae. Species ''Pursh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Purshia Pinkavae
''Purshia'' (bitterbrush or cliff-rose) is a small genus of 5–8 species of flowering plants in the family Rosaceae which are native to western North America. Description ''Purshia'' species form deciduous or evergreen shrubs, typically reaching tall. The leaves are long, deeply three- to five-lobed, with revolute margins. The flowers are 1–2 cm in diameter, with five white to pale yellow or pink petals and yellow stamens. The fruit is a cluster of dry, slender, leathery achenes which are 2–6 cm long. The roots have nodules that host nitrogen-fixing ''Frankia'' bacterium. Taxonomy Taxonomic history The genus was originally placed in the subfamily Rosoideae. In the past, the evergreen species were treated separately in the genus ''Cowania''; this genus is still accepted by some botanists. Modern classification The classification of ''Purshia'' within the family Rosaceae has been unclear. It is now placed in the subfamily Dryadoideae. Species ''Purshia'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Purshia Ericifolia
''Purshia'' (bitterbrush or cliff-rose) is a small genus of 5–8 species of flowering plants in the family Rosaceae which are native to western North America. Description ''Purshia'' species form deciduous or evergreen shrubs, typically reaching tall. The leaves are long, deeply three- to five-lobed, with revolute margins. The flowers are 1–2 cm in diameter, with five white to pale yellow or pink petals and yellow stamens. The fruit is a cluster of dry, slender, leathery achenes which are 2–6 cm long. The roots have nodules that host nitrogen-fixing ''Frankia'' bacterium. Taxonomy Taxonomic history The genus was originally placed in the subfamily Rosoideae. In the past, the evergreen species were treated separately in the genus ''Cowania''; this genus is still accepted by some botanists. Modern classification The classification of ''Purshia'' within the family Rosaceae has been unclear. It is now placed in the subfamily Dryadoideae. Species ''Purshia'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Purshia Glandulosa
''Purshia glandulosa'' is a species of flowering plant in the rose family known by the common names antelope bitterbrush, desert bitterbrush, Mojave antelope brush. Distribution The plant is endemic to the southwestern United States, where it occurs in California, Arizona, southern Nevada, and Utah.Zlatnik, Elena. 1999USDA Forest Service: ''Purshia glandulosa''.In: Fire Effects Information System nline Rocky Mountain Research Station, Fire Sciences Laboratory. It is found in the Great Basin region, Mojave Desert, and chaparral- sagebrush scrub ecotone in the Eastern Sierra Nevada, Tehachapi Mountains, Eastern Transverse Ranges, and Peninsular Ranges. Other habitats include pinyon-juniper woodland, conifer forest, and Joshua tree woodland. This species arose via hybridization between ''Purshia stansburiana'' (Stansbury cliffrose) and ''Purshia tridentata'' (antelope bitterbrush) . It is sometimes considered a variety of the latter species. It can hybridize with both of it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Purshia Tridentata
''Purshia tridentata'', with the common name bitterbrush, is a shrub in the genus '' Purshia'' of the family Rosaceae. It is native to mountainous areas of western North America. Common names include antelope bitterbrush, antelope bush, buckbrush, quinine brush, and less commonly deerbrush, blackbrush, and greasewood. Some of these names are shared with other species. Description ''Purshia tridentata'' is a deciduous shrub growing to a height of . It has many branches and slender green, three- to five-lobed leaves 5–20 millimetres long. It is a nitrogen-fixing plant. The flowers are pale yellow, with five petals 6–8 mm long, and darker yellow anthers. The fruit is a cluster of dry, slender, leathery achenes 0.6–2 centimetres long. Varieties There are two named varieties of the species: *''Purshia tridentata var. glandulosa'' — Eastern Sierra Nevada, Southern California *''Purshia tridentata var. tridentata'' Distribution The plant is found fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Purshia Stansburyana
''Purshia stansburyana'' is a species of flowering plant in the rose family known by the common name Stansbury's cliffrose. It is native to the southwestern United States and northern Mexico, where it grows in woodlands, desert, and plateau habitat. It often grows anchored on cliffs and prefers rocky, granular soils, especially limestone. Orthography The species name was originally spelled ''P. stansburiana'', but due to a 2006 rule change under the ICBN, the last letter has been restored since the plant was named in honor of Howard Stansbury. Description ''Purshia stansburyana'' is a shrub generally growing up to about one to three meters tall, known to approach 4 meters to up to 8 meters in exceptional circumstances, becoming somewhat treelike. It easily hybridizes with other '' Purshia'' species. It is covered in shreddy bark. The small, very thick, glandular leaves are divided into several lobes which may be divided into sub-lobes. The leaves on the upper side are dotted ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Purshia Mexicana
''Purshia mexicana'' is a species of perennial flowering small tree in the rose family known by the common name Mexican cliffrose. It is native to western-northern Mexico, the region of the Sierra Madre Occidental cordillera. ''Purshia stansburyana'', native to the southwestern United States, has sometimes been included within ''P. mexicana''. In its mostly mountainous, or higher elevation habitat, it grows in woodlands, desert, and plateau habitat. Stenophyllanin A, a tannin, can be found in ''P. mexicana''. Distribution The range of Mexican cliffrose is from the western Mexican Plateau in the south, and the southern Sierra Madre Occidental cordillera north to a small region of northwest Sonora; it has a continuous range in the cordillera from Chihuahua south through Durango and Zacatecas, all mostly north of the Trans-Mexican Volcanic Belt The Trans-Mexican Volcanic Belt ( es, Eje Volcánico Transversal), also known as the Transvolcanic Belt and locally as the (''Snowy M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rosaceae
Rosaceae (), the rose family, is a medium-sized family of flowering plants that includes 4,828 known species in 91 genera. The name is derived from the type genus ''Rosa''. Among the most species-rich genera are '' Alchemilla'' (270), '' Sorbus'' (260), '' Crataegus'' (260), '' Cotoneaster'' (260), '' Rubus'' (250), and '' Prunus'' (200), which contains the plums, cherries, peaches, apricots, and almonds. However, all of these numbers should be seen as estimates—much taxonomic work remains. The family Rosaceae includes herbs, shrubs, and trees. Most species are deciduous, but some are evergreen. They have a worldwide range but are most diverse in the Northern Hemisphere. Many economically important products come from the Rosaceae, including various edible fruits, such as apples, pears, quinces, apricots, plums, cherries, peaches, raspberries, blackberries, loquats, strawberries, rose hips, hawthorns, and almonds. The family also includes popular ornamental trees and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Root Nodule
Root nodules are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria. Under nitrogen-limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia. This process has evolved multiple times within the legumes, as well as in other species found within the Rosid clade. Legume crops include beans, peas, and soybeans. Within legume root nodules, nitrogen gas (N2) from the atmosphere is converted into ammonia (NH3), which is then assimilated into amino acids (the building blocks of proteins), nucleotides (the building blocks of DNA and RNA as well as the important energy molecule ATP), and other cellular constituents such as vitamins, flavones, and hormones. Their ability to fix gaseous nitrogen makes legumes an ideal agricultural organism as their requirement for nitrogen fertilizer is reduced. Indeed, high nitrogen content blocks nodule development as there is no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dryadoideae
The subfamily Dryadoideae consists of four genera in the family Rosaceae,. all of which contain representative species with root nodules that host the nitrogen-fixing bacterium ''Frankia''. They are subshrubs, shrubs, or small trees with a base chromosome number of 9, whose fruits are either an achene An achene (; ), also sometimes called akene and occasionally achenium or achenocarp, is a type of simple dry fruit produced by many species of flowering plants. Achenes are monocarpellate (formed from one carpel) and indehiscent (they do not ope ... or an aggregate of achenes. Taxonomic history The subfamily has at various times been separated as its own family (Dryadaceae), or as a tribe (Dryadeae) or subtribe (Dryadinae). References External links * * Rosid subfamilies {{rosaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rosoideae
The rose subfamily Rosoideae consists of more than 850 species, including many shrubs, perennial herbs, and fruit plants such as strawberries and brambles. Only a few are annual herbs. The circumscription of the Rosoideae is still not wholly certain; recent genetic research has resulted in several changes at the genus level and the removal from Rosoideae of some genera (notably '' Cercocarpus'', '' Cowania'', '' Dryas'' and '' Purshia'') previously included in the subfamily. Genera *'' Acaena'' – bidibidis *''Agrimonia'' – agrimonies *'' Alchemilla'' – lady's mantles *'' Aphanes'' – parsley-pierts (sometimes in ''Alchemilla'') *''Aremonia'' *''Argentina'' – silverweeds (sometimes in ''Potentilla'') *''Bencomia'' *''Chamaerhodos'' Bunge – little-rose *''Cliffortia'' *''Coluria'' *'' Comarum'' (formerly in ''Potentilla'') *'' Dasiphora'' – woody cinquefoils (formerly in ''Potentilla'') *'' Dendriopoterium'' (currently in ''Sanguisorba'') *'' Drymocallis'' – sticky ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frankia
''Frankia'' is a genus of nitrogen-fixing bacteria that live in symbiosis with actinorhizal plants, similar to the '' Rhizobium'' bacteria found in the root nodules of legumes in the family Fabaceae. ''Frankia'' also initiate the forming of root nodules. This genus was originally named by Jørgen Brunchorst, in 1886 to honor the German biologist Albert Bernhard Frank. Brunchorst considered the organism he had identified to be a filamentous fungus. redefined the genus in 1970 as containing prokaryotic actinomycetes and created the family Frankiaceae within the Actinomycetales. He retained the original name of ''Frankia'' for the genus. Overview Most ''Frankia'' strains are specific to different plant species. The bacteria are filamentous and convert atmospheric nitrogen into ammonia via the enzyme nitrogenase, a process known as nitrogen fixation. They do this while living in root nodules on actinorhizal plants. The bacteria can supply most or all of the nitrogen req ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
