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Erigeron hyperboreus : ウィキペディア英語版 | Erigeron hyperboreus
''Erigeron hyperboreus'' is a rare Arctic species of flowering plant in the aster family known by the common name Tundra fleabane. It has been found only in arctic tundra in Alaska, Yukon, and Northwest Territories.〔(Biota of North America Program 2014 state-level distribution map )〕 ==Description== ''Erigeron hyperboreus'' is a small perennial her rarely more than 15 centimeters (6 inches) tall, spreading by means of underground rhizomes. Each plant generally produces only one flower head, with 30-60 white or blue ray florets surrounding yellow disc florets.〔(Greene, Edward Lee 1892. Pittonia 2(11B): 227 )〕〔(Flora of North America, ''Erigeron hyperboreus'' Greene, Tundra fleabane )〕
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