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Erigeron rydbergii : ウィキペディア英語版 | Erigeron rydbergii
''Erigeron rydbergii'' is a North American species of flowering plant in the daisy family known by the common name Rydberg’s fleabane..〔 It is native to the western United States, in the Rocky Mountains and other nearby ranges in the States of Montana, Wyoming, Idaho, and Utah.〔(Biota of North America Program 2014 county distribution map )〕 ''Erigeron rydbergii '' grows in subalpine to alpine slopes at high elevations. It is a tiny perennial rarely more than 6 centimeters (2.4 inches) tall, forming a thick taproot. The inflorescence generally contains only 1 flower head per stem. Each head contains 15–35 blue, purple, or rarely white ray florets surrounding many yellow disc florets.〔(Flora of North America, ''Erigeron rydbergii'' Cronquist, 1947. Rydberg’s fleabane )〕 ==References==
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