Family Code: POACEA Genus Code: ARIST Genus CN: threeawn Genus Authority: L. Genus Summary: A genus of about 250-300 species, widespread in the tropics, subtropics, and warm temperate zones. Cerros-Tlatilpa, Columbus, & Barker (2011) disuss the phylogeny of the genus. Genus Identification: Identification notes: The awns must be dry and relatively mature to assume their characteristic positions (immature awns and moist mature awns are erect and parallel). It is sometimes useful to dry a collection unpressed. Beware, however, that drying followed by dispersal can take place very quickly under the right conditions (such as the dashboard of a hot car)! Genus References: Allred in FNA (2003a); Allred (1986)=Z; Allred (1984, 1985); Peet (1993)=Y; Ward (2001)=X; Henrard (1929)=Q; Kesler, Anderson, & Hermann (2003)=V. Key adapted, in part, from Z. Last Updated: 2019-11-29 Publish: 1