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''Artemisia tridentata'', commonly called "big sagebrush",〔Mojave Desert Wildflowers, Pam MacKay, 2nd ed., 2013, ISBN 978-0-7627-8033-4〕 Great Basin sagebrush〔 or "sagebrush", is an aromatic shrub from the family Asteraceae, which grows in arid and semi-arid conditions, throughout a range of cold desert, steppe, and mountain habitats in the Intermountain West of North America. The vernacular name "sagebrush" is also used for several related members of the genus ''Artemisia'', such as California Sagebrush (''Artemisia californica''). Big Sagebrush and other ''Artemisia'' shrubs are the dominant plant species across large portions of the Great Basin. The range extends northward through British Columbia's southern interior, south into Baja California, and east into the western Great Plains of New Mexico, Colorado, Nebraska, and the Dakotas.〔(Biota of North America Program 2014 county distribution map )〕〔(Calflora taxon report, University of California, ''Artemisia tridentata'' Nutt. Common sagebrush, big sagebrush )〕 Several major threats exist to sage brush ecosystems, including human settlements, conversion to agricultural land, livestock grazing, invasive plant species, wildfires, and climate change. Sagebrush provides food and habitat for a variety of species, such as sage grouse, pronghorn antelope, gray vireo, pygmy rabbit, and mule deer. ''Artemisia tridentata'' is the state flower of Nevada. ==Taxonomy== Much discussion and disagreement revolves around the question of how to divide the species into varieties and subgenera. The following subspecies are accepted by some authors, though others advocate different systems.〔http://plants.usda.gov/plantguide/pdf/pg_artrw8.pdf〕〔(Flora of North America, ''Artemisia tridentata'' Nuttall )〕 * ''A. tridentata'' subsp. ''tridentata'' ("basin big sagebrush") * ''A. tridentata'' subsp. ''vaseyana'' ("mountain big sagebrush") * ''A. tridentata'' subsp. ''wyomingensis'' ("Wyoming big sagebrush") -- Found in the drier portions of the sagebrush steppe. Shrub density is generally less than 1 plant/m2, with little herbaceous cover surrounding the shrub. * ''A. tridentata'' subsp. ''xericensis'' ("scabland big sagebrush") * ''A. tridentata'' subsp. ''spiciformis'' ("subalpine big sagebrush") * ''A. tridentata'' subsp. ''parishii'' ("Parish's big sagebrush") - 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Artemisia tridentata」の詳細全文を読む スポンサード リンク
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