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Gamochaeta stagnalis : ウィキペディア英語版 | Gamochaeta stagnalis
''Gamochaeta stagnalis'', the Desert cudweed, is a species of flowering plant in the sunflower family. It is native to Mexico, Guatemala, and the southwestern United States (California, Arizona, New Mexico).〔(Guy L. Nesom 2004. New distribution records for ''Gamochaeta'' (Asteraceae: Gnaphalieae) in the United States. Sida 21(2): 1175–1185. )〕〔(Biota of North America Program 2014 county distribution map )〕〔(Calflora taxon report, University of California, ''Gamochaeta stagnalis'' (I.M. Johnst.) Anderb. )〕 ''Gamochaeta stagnalis'' is an annual herb up to tall, producing a slender taproot. Leaves are up to long. The plant forms many small flower heads in tightly packed clumps. Each head contains 3-4 purple disc flowers but no ray flowers.〔〔(Flora of North America, ''Gamochaeta stagnalis'' (I. M. Johnston) Anderberg, 1991. Desert cudweed )〕 ''Gamochaeta stagnalis'' is very similar to ''G. purpureum'' and some ''G. stagnalis'' specimens (especially from Arizona) have been misidentified as that species.〔 ==References==
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