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Erigeron compositus : ウィキペディア英語版 | Erigeron compositus
''Erigeron compositus'' is an Arctic and alpine species of fleabane in the daisy family.〔(S.G. Aiken, M.J. Dallwitz, L.L. Consaul, C.L. McJannet, R.L. Boles, G.W. Argus, J.M. Gillett, P.J. Scott, R. Elven, M.C. LeBlanc, L.J. Gillespie, A.K. Brysting, H. Solstad, and J.G. Harris 2007. Flora of the Canadian Arctic Archipelago, ''Erigeron compositus'' Pursh )〕 Common names include dwarf mountain fleabane, cutleaf daisy, and trifid mountain fleabane〔http://plants.usda.gov/java/profile?symbol=erco4〕〔(Pan-arctic flora, 860701 ''Erigeron compositus'' Pursh )〕 ''Erigeron compositus'' has been found in the Russian Far East (Wrangel Island and Chukotka), Alaska, Greenland, much of Canada (all 3 Arctic territories plus British Columbia, all 3 Prairie Provinces, Quebec, Newfoundland, and Nova Scotia), and the western United States (from the Pacific Coast as far east as the Dakotas, Colorado, and New Mexico).〔〔(Biota of North America Program 2014 state-level distribution map )〕 ''Erigeron compositus'' is perennial herb rarely more than tall. It produces a taproot and spreads by means of horizontal underground rhizomes. A plant generally produces only one flower head per stem, each head with 20–60 white, pink or blue ray florets, these sometimes small and easily mistaken for disc florets. Genuine disc florets are yellow and in the center of the head.〔(Flora of North America, ''Erigeron compositus'' Pursh, Fl. Amer. September 2: 535. 1813. Dwarf mountain fleabane, vergerette à feuilles segmentées )〕 ==References==
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