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Streptanthus niger : ウィキペディア英語版 | Streptanthus niger
''Streptanthus niger'' is an endangered species within the family Brassicaceae. Like other genus members, this herb has wavy petal margins with perimeter calluses that discourage larval herbivory.〔Kruckeberg & Morrison 1983 Madroño 30:230–244〕 This plant is endemic to the Tiburon Peninsula〔''Marinero Estates Environmental Impact Report, Tiburon, California'', Earth Metrics Inc., prepared for the city of Tiburon, Ca (1989)〕 of Northern California, and occurs at elevations below 150 m on serpentine grasslands.〔''Jepson Manual'', University of California Press (1993)〕 The common name for this species is Tiburon Jewelflower or Black Jewelflower. This annual herb blooms in May and June and displays dark purple sepals. The etymology of this genus scientific name derives from the Greek word ''streptanthus'', meaning ''twisted flower'', with reference to the notable wavy margins of the petals. The species name ''niger'' relates to the color of the seeds being black, although an alternate account cites the dark color of the petals as the source of the appellation. ==Description==
''Streptanthus niger'' is an annual herb attaining a height of 20 to 70 centimeters. The plant architecture may manifest as simple-stemmed or branching in the upper part. Lower portions of the stems are smooth and practically hairless. This self-pollinated plant has dark purple, almost black, flower petals; moreover, the petals have a purple claw and a white blade with a purple midvein. The zig-zag inflorescence pattern is an identifying characteristic; furthermore, the flower is almost closed at its throat. Sepals measure five to seven mm. The characteristic wavy petal margins have calluses that inhibit larval herbivory. The leaves of ''S. niger'' appear in a basal manifestation and measure less than nine centimeters in length; leaves are generally oblanceolate in shape, and may appear as coarsely dentate or short-lobed. Chromosomal characterization is 2n=28.
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