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Facelis retusa : ウィキペディア英語版 | Facelis retusa
''Facelis retusa'' (annual trampweed) is a South American species flowering plants in the sunflower family. It is native Brazil, Bolivia, Paraguay, Uruguay, northern Argentina, Chile; naturalized in parts of Africa,〔Gibbs Russell, G. E., W. G. M. Welman, E. Retief, K. L. Immelman, G. Germishuizen, B. J. Pienaar, M. Van Wyk & A. Nicholas. 1987. List of species of southern African plants. Memoirs of the Botanical Survey of South Africa 2(1–2): 1–152(pt. 1), 1–270(pt. 2).〕 Australia, and North America including the southeastern and south-central United States, and considered as a noxious weed in some of those places.〔(Biota of North America Program 2014 county distribution map )〕〔(Frank M. Watson, University of Georgia, College of Agricultural and Environmental Sciences, Weed covers turfgrass with snowy appearance )〕〔(Tropicos, ''Facelis retusa'' (Lam.) Sch. Bip. )〕〔(Atlas of Living Australia )〕 ''Facelis retusa'' is an annual herb with the stems up to 30 cm (1-foot) long, very often trailing along the surface of the ground. Leaves are crowded along the stem, each up to long. Flower heads are in clusters, with white or purple disc flowers but no ray flowers. The achene has several long, feathery bristles that give a white appearance and assure effective seed dispersal.〔(Flora of North America, ''Facelis'' Cassini, 1819. )〕 ==References==
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