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Isocoma arguta : ウィキペディア英語版 | Isocoma arguta
''Isocoma arguta'' is a rare species of flowering plant in the daisy family known by the common name Carquinez goldenbush. It has been found only in Solano and Contra Costa Counties in California, where it grows in the Sacramento-San Joaquin River Delta.〔(Calflora taxon report, University of California, ''Isocoma arguta'' E. Greene, Carquinez goldenbush, )〕 It is a resident of Suisun Marsh. It thrives on alkali flats and other mineral-rich soils. ==Description== ''Isocoma arguta'' is a compact subshrub reaching about half a meter-1.5 feet (20-60 inches) tall and wide with erect, multibranched stems. The hairy stems bear small gray-green, nonfleshy, glandular leaves each less than long. 〔(Flora of North America, ''Isocoma arguta'' Greene, 1894. Contra Costa jimmyweed , Carquinez or suisun goldenbush )〕 The inflorescences hold clusters of thick, knobby flower heads. Each head is a capsule of layered greenish glandular phyllaries with an array of 10-13 cylindrical, protruding golden yellow disc florets at one end. There are no ray florets.〔
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