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Palafoxia riograndensis : ウィキペディア英語版 | Palafoxia riograndensis
''Palafoxia riograndensis,'' the Rio Grande palafox or Rio Grande Spanish needles, is a plant species native to Texas, Chihuahua and Coahuila. It is named for the Rio Grande which separates Texas from Mexico. The plant grows in sandy and silty soils at elevations of .〔(Flora of North America v 21 p 390. )〕 ''Palafoxia riograndensis'' is an annual herb up to tall. Flowering heads have no ray flowers but 8-25 pink, purple or white disc flowers.〔Turner, B. L. and M. I. Morris. 1976. Systematics of ''Palafoxia'' (Asteraceae: Helenieae). Rhodora 78: 567–628.〕〔(Cory, Victor Louis. 1946. Genus ''Palafoxia'' in Texas. Rhodora 48(568): 84–86. )〕〔Correll, D. S. & M. C. Johnston. 1970. Manual of the Vascular Plants of Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson.〕 ==References==
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