Cyperus pseudothyrsiflorus

Cyperus pseudothyrsiflorus is a plant species native to Nuevo León, New Mexico and Texas, a member of "Cyperus" subgenus "Cyperus". It occurs in cultivated fields and other disturbed areas at elevations of less than 1000 m (3400 feet).
"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.