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Draba graminea
''Draba graminea'' is a species of flowering plant in the mustard family known by the common names Rocky Mountain draba and San Juan Whitlow-grass. It is endemic to the state of Colorado in the United States, where it is limited to the San Juan Mountains.〔(''Draba graminea''. ) NatureServe.〕
This species is a small perennial herb forming a clump just a few centimeters tall. The leaves are linear to lance-shaped. The inflorescence is a raceme of up to 15 flowers with yellow petals up to half a centimeter long. The fruit is a flattened oval or lance-shaped silique up to 1.1 centimeters long.〔(''Draba graminea''. ) Flora of North America.〕
This plant grows in high mountain habitat types, mainly in alpine climates, and sometimes in the subalpine zone. It grows in rocky talus and tundra habitat, most commonly in the latter. It grows in areas where snow persists most of the year. The soils are gravelly and sandy and mostly of volcanic origin. The plant can be found in rock cracks. Associated plants include ''Ranunculus macauleyi'', ''Poa alpina'', ''Festuca brachyphylla'' ssp. ''coloradensis'', ''Geum rossii'' var. ''turbinatum'', and ''Silene acaulis'' var. ''subacaulescens''.〔Moore, L. and S. Friedley. (2004, September 30). (''Draba graminea'' Green (Rocky Mountain draba): a technical conservation assessment. ) (). USDA Forest Service, Rocky Mountain Region.〕
Threats to the species are uncertain due to the remoteness and inaccessibility of the habitat.〔〔 The main threat is thought to be recreational activity.〔
==References==
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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