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Sibara filifolia
''Sibara filifolia'', known the common names Santa Cruz Island winged rockcress or Santa Cruz Island rockcres, is a rare species of flowering plant in the mustard family. It is endemic to the Channel Islands of California, where it is now known from a few occurrences on San Clemente Island and one population on Catalina Island.〔McGlaughlin, M. E., L. E. Wallace, and K. Helenurm. (2008). (Isolation of microsatellite loci from the endangered plant ''Sibara filifolia'' (Brassicaceae). ) ''Molecular Ecology Resources'' 8 367-69.〕
It was once present on Santa Cruz Island, and perhaps other Channel Islands, but these occurrences were extirpated by feral goats and pigs.〔(Center for Plant Conservation )〕 The plant was feared extinct until small remaining occurrences were discovered in 1986.〔(California Native Plant Society Rare Plant Profile )〕 A 1995 estimate of the total remaining population was 500 individuals.〔 The plant became a federally listed endangered species of the United States in 1997, along with ''Cercocarpus traskiae'' and ''Lithophragma maximum'', two other rare Channel Islands plants.〔USFWS. (Determination of endangered status for three plants from the Channel Islands of California. ) ''Federal Register'' 62:153 August 8, 1997.〕
==Description==
''Sibara filifolia'' is an annual herb producing a hairless, sometimes waxy stem up to around 30 centimeters in maximum height. The leaves are very narrow and almost strandlike, measuring less than a millimeter wide, and growing about 1.5 centimeters long. The flowers each have four spoon-shaped lavender petals a few millimeters long. The fruit is a flattened, elongated silique up to 4 centimeters long containing tiny 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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