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Cyperus pseudothyrsiflorus : ウィキペディア英語版 | Cyperus pseudothyrsiflorus
''Cyperus pseudothyrsiflorus'' is a plant species native to Nuevo León, New Mexico and Texas,〔(Kew World Checklist of Selected Plant Families )〕〔(Biota of North America Program, 2013 county distribution map )〕〔(Carter, James Richard & Jones, Standley D. 1998. Rhodora 99(900): 330. )〕 a member of ''Cyperus'' subgenus ''Cyperus''. It occurs in cultivated fields and other disturbed areas at elevations of less than 1000 m (3400 feet).〔(Flora of North America v 23 p 185. )〕 ''Cyperus pseudothyrsiflorus'' is a perennial herb spreading by underground rhizomes. Stems are triangular in cross-section, up to 40 cm (16 inches) tall. It is closely related to ''C. retroflexus'' and considered a variety of that species by some authors.〔(Carter, James Richard & Jones, Standley D. 1997. Notes on the ''Cyperus retroflexus'' complex (Cyperaceae) with three nomenclatural proposals. Rhodora 99(900): 319-334. )〕〔Engler, Heinrich Gustav Adolf. Das Pflanzenreich IV. 20(Heft 101): 521. 1936.〕〔Donovan Stewart Correll & Marshall Conring Johnston. 1970. Manual of the Vascular Plants of Texas. Texas Research Foundation.〕 ==References==
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