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Bitterbrush
''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 root nodule, 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 ''Pur ... [...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 ... [...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 its pa ... [...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 root nodule, 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 ''Pur ... [...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'' comp ... [...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'' comp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nitrogen-fixing
Nitrogen fixation is a chemical process by which molecular nitrogen (), with a strong triple covalent bond, in the air is converted into ammonia () or related nitrogenous compounds, typically in soil or aquatic systems but also in industry. Atmospheric nitrogen is molecular dinitrogen, a relatively nonreactive molecule that is metabolically useless to all but a few microorganisms. Biological nitrogen fixation or ''diazotrophy'' is an important microbials mediated process that converts dinitrogen (N2) gas to ammonia (NH3) using the nitrogenase protein complex (Nif). Nitrogen fixation is essential to life because fixed inorganic nitrogen compounds are required for the biosynthesis of all nitrogen-containing organic compounds, such as amino acids and proteins, nucleoside triphosphates and nucleic acids. As part of the nitrogen cycle, it is essential for agriculture and the manufacture of fertilizer. It is also, indirectly, relevant to the manufacture of all nitrogen chemical compo ... [...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 benefit ... [...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 cin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canada
Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by total area. Its southern and western border with the United States, stretching , is the world's longest binational land border. Canada's capital is Ottawa, and its three largest metropolitan areas are Toronto, Montreal, and Vancouver. Indigenous peoples have continuously inhabited what is now Canada for thousands of years. Beginning in the 16th century, British and French expeditions explored and later settled along the Atlantic coast. As a consequence of various armed conflicts, France ceded nearly all of its colonies in North America in 1763. In 1867, with the union of three British North American colonies through Confederation, Canada was formed as a federal dominion of four provinces. This began an accretion of provinces an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Columbia
British Columbia (commonly abbreviated as BC) is the westernmost province of Canada, situated between the Pacific Ocean and the Rocky Mountains. It has a diverse geography, with rugged landscapes that include rocky coastlines, sandy beaches, forests, lakes, mountains, inland deserts and grassy plains, and borders the province of Alberta to the east and the Yukon and Northwest Territories to the north. With an estimated population of 5.3million as of 2022, it is Canada's third-most populous province. The capital of British Columbia is Victoria and its largest city is Vancouver. Vancouver is the third-largest metropolitan area in Canada; the 2021 census recorded 2.6million people in Metro Vancouver. The first known human inhabitants of the area settled in British Columbia at least 10,000 years ago. Such groups include the Coast Salish, Tsilhqotʼin, and Haida peoples, among many others. One of the earliest British settlements in the area was Fort Victoria, established ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hybrid (biology)
In biology, a hybrid is the offspring resulting from combining the qualities of two organisms of different breeds, varieties, species or genera through sexual reproduction. Hybrids are not always intermediates between their parents (such as in blending inheritance), but can show hybrid vigor, sometimes growing larger or taller than either parent. The concept of a hybrid is interpreted differently in animal and plant breeding, where there is interest in the individual parentage. In genetics, attention is focused on the numbers of chromosomes. In taxonomy, a key question is how closely related the parent species are. Species are reproductively isolated by strong barriers to hybridisation, which include genetic and morphological differences, differing times of fertility, mating behaviors and cues, and physiological rejection of sperm cells or the developing embryo. Some act before fertilization and others after it. Similar barriers exist in plants, with differences in flowering tim ... [...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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
