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Gamochaeta ustulata
''Gamochaeta ustulata'', called Featherweed or Pacific cudweed, 〔 is a North American species of flowering plant in the sunflower family. It is native to the western United States and southwestern Canada, in British Columbia, Washington, Oregon, and California. It is found primarily on seaside hills and in the Coast Ranges, with additional populations inland.〔(Guy L. Nesom 2004. New distribution records for ''Gamochaeta'' (Asteraceae: Gnaphalieae) in the United States. Sida 21(2): 1175–1185. )〕〔(Nesom, Guy L. 2004. Sida 21(2): 717-741 ) in English with Spanish summary, description on pages 724-725, county-level distribution map on page 732〕〔(Biota of North America Program 2014 county distribution map )〕〔(Calflora taxon report, University of California, ''Gamochaeta ustulata'' (Nutt.) Nesom, featherweed )〕
''Gamochaeta ustulata'' is an annual or perennial herb up to tall. Leaves are up to long, green on the top but appearing white on the underside because of many woolly hairs. The plant forms many small flower heads in elongated arrays. Each head contains 4-6 yellow disc flowers but no ray flowers.〔(Flora of North America, ''Gamochaeta ustulata'' (Nuttall) Holub, 1976. Featherweed, Pacific cudweed )〕
==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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