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Pseudoroegneria spicata
''Pseudoroegneria spicata'' is a species of grass known by the common name bluebunch wheatgrass. This native western North American perennial bunchgrass is known by the scientific synonyms ''Elymus spicatus'' and ''Agropyron spicatum''. The grass can be found in the United States, Canada, and Mexico from Alaska and Yukon south as far as Sonora and Nuevo León.〔(US Forest Service Fire Ecology )〕〔(Biota of North America Program 2014 state-level distribution map )〕〔(SEINet, Southwestern Biodiversity, Arizona chapter ) photos, description, distribution map〕 It is the dominant species of grass among the mountainous regions of the western United States, occurring at elevations that range from 150-3,000 m and where precipitation is 250–500 mm. It occurs in many types of habitat, including sagebrush, forests, woodlands, and grasslands. It is a dominant grass in some habitat types.
==Description==
Bluebunch wheatgrass can often be distinguished from other bunchgrasses by the awns on its seedheads which stand out at an angle nearly 90 degrees from the stem. It is often bluish. The roots of the grass have a waxy layer that helps it resist desiccation in dry soils.〔 In areas with more moisture the grass may produce rhizomes.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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