Cyperus retroflexus Buckley var. pumilus (Britton) R. Carter & S.D. Jones. Phen: Jul-Sep. Hab: Cropped fields, seasonally damp, disturbed areas. Dist: AL west to NM, south to Mexico.
ID notes: Spikes are quite similar to C. retrorsus at a glance. The sterile, reduced terminal scales, usually with a minute, uncinate mucro are diagnostic. C. retrorsus is a more robust plant with erect or strongly ascending bracts, and broader leaves and bracts.
Synonymy: = Carter & Jones (1997); = n/a – C; < Cyperus retroflexus Buckley – Ar, ETx1, FNA23, GrPl, K1, K3, K4, Mex, Mo1, NcTx