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''Erigeron poliospermus'' is a species of flowering plant in the daisy family known by the common names gray-seeded fleabane〔 and purple cushion fleabane. It has been found in British Columbia, Washington, Oregon, and Idaho.〔(Biota of North America Program 2014 county distribution map )〕 ''Erigeron poliospermus'' is a small perennial herb rarely more than 15 centimeters (6 inches) tall, producing a woody taproot. The plant generally produces only 1-3 flower heads per stem. Each head has 15–45 pink, purple, or white ray florets surrounding numerous yellow disc florets. The ray florets are lacking in var. ''disciformis''〔(Flora of North America, ''Erigeron poliospermus'' A. Gray 1884. )〕〔Cronquist, A.J. 1994. Asterales. 5: 1–496. In A.J. Cronquist, A. H. Holmgren, N. H. Holmgren, J. L. Reveal & P. K. Holmgren (eds.) Intermountain Flora. Hafner Pub. Co., New York.〕〔Scoggan, H. J. 1979. Dicotyledoneae (Loasaceae to Compositae). Part 4. 1117–1711 pp. In Flora of Canada. National Museums of Canada, Ottawa. 〕 ;Varieties *''Erigeron poliospermus'' var. ''cereus'' Cronquist - Washington *''Erigeron poliospermus'' var. ''disciformis'' (Cronquist) G.L.Nesom - Washington, Oregon〔(Nesom, Guy L. 2004. Sida 21(1): 24 )〕 *''Erigeron poliospermus'' var. ''poliospermus'' - British Columbia, Washington, Idaho, Oregon ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Erigeron poliospermus」の詳細全文を読む スポンサード リンク
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