''Cyperus pseudothyrsiflorus'' is a plant species native to

Nuevo León Nuevo León () is a state in the northeast region of Mexico. The state was named after the New Kingdom of León, an administrative territory from the Viceroyalty of New Spain, itself was named after the historic Spanish Kingdom of León. With a ...

New Mexico ) , population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano) , seat = Santa Fe , LargestCity = Albuquerque , LargestMetro = Tiguex , OfficialLang = None , Languages = English, Spanish ( New Mexican), Navajo, Ker ...

and

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

, 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.
/ref> ''Cyperus pseudothyrsiflorus'' is a

perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wide ...

herb spreading by underground

rhizomes In botany and dendrology, a rhizome (; , ) is a modified subterranean plant stem that sends out roots and shoots from its nodes. Rhizomes are also called creeping rootstalks or just rootstalks. Rhizomes develop from axillary buds and grow hori ...

. Stems are triangular in cross-section, up to 40 cm (16 inches) tall. It is a member of ''

Cyperus ''Cyperus'' is a large genus of about 700 species of sedges, distributed throughout all continents in both tropical and temperate regions. Description They are annual or perennial plants, mostly aquatic and growing in still or slow-moving w ...

'',

subgenus In biology, a subgenus (plural: subgenera) is a taxonomic rank directly below genus. In the International Code of Zoological Nomenclature, a subgeneric name can be used independently or included in a species name, in parentheses, placed between t ...

''Cyperus'',

section Section, Sectioning or Sectioned may refer to: Arts, entertainment and media * Section (music), a complete, but not independent, musical idea * Section (typography), a subdivision, especially of a chapter, in books and documents ** Section sign ...

''Umbellati''.Carter, James Richard & Jones, Standley D. 1997. Notes on the ''Cyperus retroflexus'' complex (Cyperaceae) with three nomenclatural proposals. Rhodora 99(900): 319-334.
/ref> It was first formally described as a new

variety Variety may refer to: Arts and entertainment Entertainment formats * Variety (radio) * Variety show, in theater and television Films * ''Variety'' (1925 film), a German silent film directed by Ewald Andre Dupont * ''Variety'' (1935 film), ...

of ''C. uniflorus'' by

Georg Kükenthal Georg Kükenthal (30 March 1864 in Weißenfels – 20 October 1955 in Coburg) was a German pastor and botanist who specialized in the field of caricology. He was the brother of zoologist Willy Kükenthal (1861–1922). From 1882 to 1885 he studie ...

in 1937, but was promoted to an independent species in 1997. It is very similar to ''C. uniflorus'',Donovan Stewart Correll & Marshall Conring Johnston. 1970. Manual of the Vascular Plants of Texas. Texas Research Foundation. which is now known as '' C. retroflexus''.

References

pseudothyrsiflorus Flora of New Mexico Flora of Texas Flora of Nuevo León Plants described in 1936 {{Cyperus-stub

See also

References