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Boechera perstellata
''Boechera perstellata'' (syn. ''Arabis perstellata'') is a rare species of flowering plant in the mustard family known by the common names Braun's rockcress and Nevada rockcress. It is native to Kentucky and Tennessee, where it is known from perhaps 25 total populations.〔(Center for Plant Conservation )〕 Most of the occurrences have few individuals, and all are deteriorating in quality.〔(The Nature Conservancy )〕 The plant grows in shady forest habitat on limestone substrates, usually near streams or rivers.〔〔 This is a federally listed endangered species of the United States.〔USFWS. (Determination of endangered status for ''Arabis perstellata''. ) ''Federal Register'' January 3, 1995.〕
==Characteristics==
This rockcress is a perennial herb with decumbent stems reaching 80 centimeters in length. The stems spread out horizontally, and often droop over the side of any structure the plant may be growing on, such as a rock or cliffside. The leaves are arranged in a basal rosette with some alternately arranged along the stem. The stems and leaves are gray-green in color due to a coating of whitish star-shaped hairs. The inflorescence is a raceme of flowers with four white or lavender petals each a few millimeters long. The fruit is a hairy silique 1.5 to 2 centimeters in length which contains tiny reddish seeds.
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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