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Bidens leptocephala : ウィキペディア英語版 | Bidens leptocephala
''Bidens leptocephala'' (fewflower beggarticks) is a North American species of flowering plant in the daisy family. It is native to the southwestern United States (Arizona, New Mexico, western Texas)〔(Biota of North America Program 2014 county distribution map )〕 and northern Mexico (Chihuahua, Sonora, Baja California, Baja California Sur).〔(Flora of North America, ''Bidens leptocephala'' Sherff, Bot. Gaz. 64: 22. 1917 )〕〔(SEINet, Southwestern Biodiversity, Arizona Chapter, ''Bidens leptocephala'' Sherff ) description, photos, distribution map〕 ''Bidens leptocephala'' is an annual herb up to 50 cm (20 inches) tall. Flower heads are sometimes borne one at a time, sometimes in groups of 2 or 3, each head yellow or white with disc florets and sometimes with ray florets. The species usually grows on streambanks.〔〔(Sherff, Earl Edward 1917. Botanical Gazette 64(1): 22–23. ) description in Latin, commentary in English〕 ==References==
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