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Erigeron howellii : ウィキペディア英語版 | Erigeron howellii
''Erigeron howellii '' is a rare North American species of flowering plant in the aster family known as Howell’s fleabane.〔 It has been found in the Cascades in the northwestern United States, in northwestern Oregon and southwestern Washington.〔(Biota of North America Program 2014 county distribution map )〕 ''Erigeron howellii '' is a perennial herb up to 50 centimeters (20 inches) tall, spreading by means of underground rhizomes. Each plant generally produces only one flower head, with up to 50 white ray florets surrounding numerous yellow disc florets.〔(Flora of North America, ''Erigeron howellii'' (A. Gray) A. Gray, 1884. Howell’s fleabane )〕〔(Gray, Asa 1884. Synoptical Flora of North America 1(2): 209 )〕 ==References==
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