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Astranthium robustum : ウィキペディア英語版 | Astranthium robustum
''Astranthium robustum'', or Texas western-daisy, is a North American species of flowering plants in the daisy family. It is found only in the western (trans-Pecos) part of the US State of Texas.〔De Jong, D. C. D. 1965. A systematic study of the genus ''Astranthium'' (Compositae, Astereae). Publications of the Museum of Michigan State University, Biological Series 2: 429–528.〕〔(Biota of North America Program 2014 county distribution map )〕〔(William R. Carr, The Nature Conservancy of Texas. 2009. No Place but Texas: An Annotated List of Plant Taxa Endemic to the Lone Star State )〕 ''Astranthium robustum'' is an annual with a taproot, and usually with several stems up to 50 cm (20 inches) tall. Flower heads have white or bluish ray florets and yellow disc florets.〔(Flora of North America, Texas western-daisy, ''Astranthium robustum'' (Shinners) De Jong, Publ. Mus. Michigan State Univ., Biol. Ser. 2: 521. 1965 )〕 ==References==
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