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Erigeron gracilis : ウィキペディア英語版 | Erigeron gracilis
''Erigeron gracilis'' is a North American species of flowering plant in the daisy family known by the common name quill fleabane.〔 ''Erigeron gracilis'' is native to the Rocky Mountains of the United States, in the States of Idaho, Montana, and Wyoming.〔〔(Biota of North America Program 2014 county distribution map )〕 Some of the known populations lie inside Yellowstone National Park.〔(Rydberg, Per Axel 1900. Memoirs of The New York Botanical Garden 1: 404 )〕 ''Erigeron gracilis'' is a perennial herb up to 20 cm (20 inches) tall, spreading by means of underground rhizomes. The plant generally produces only one flower heads per stem. Each head contains as many as 10 blue or purple ray florets surrounding numerous yellow disc florets.〔(Flora of North America, ''Erigeron gracilis'' Rydberg, 1900. Quill fleabane )〕 ==References==
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