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Machaeranthera asteroides
''Machaeranthera asteroides'' (fall tansyaster) is a North American species of plants in the sunflower family. It is native to the southwestern United States (California, Arizona, Nevada, New Mexico, Colorado, Utah) and northern Mexico (Chihuahua, Sonora, Baja California).〔(Biota of North America Program 2014 county distribution map )〕
''Machaeranthera asteroides'' is a biennial or perennial herb with a woody taproot. It often grows in a clump of several stems. Ray florets in the flower heads are white or purple, and female. Disc florets are yellow and bisexual.〔〔(Wooton, Elmer Ottis & Standley, Paul Carpenter 1913. Contributions from the United States National Herbarium 16(4): 189 ) as ''Machaeranthera simplex'' 〕
;Varieties〔〔(Flora of North America, ''Dieteria asteroides'' Torrey in W. H. Emory, Not. Milit. Reconn. 141. 1848. )〕
* ''Machaeranthera asteroides'' var. ''asteroides'' - California, Arizona, Nevada, New Mexico, Chihuahua, Sonora
* ''Machaeranthera asteroides'' var. ''lagunensis'' (D.D.Keck) B.L.Turner Baja California; Laguna Mountains in San Diego County in California
* ''Machaeranthera asteroides'' var. ''glandulosa'' B.L.Turner - Arizona, Nevada, New Mexico, Utah
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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