Flora of the Southeastern United States
2022 Edition


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Aristida Linnaeus. Subfamily: Aristidoideae. Tribe: Aristideae. clade: "PACMAD". Three-awn Grass.

Key to Aristida

A genus of about 250-300 species, widespread in the tropics, subtropics, and warm temperate zones. Cerros-Tlatilpa, Columbus, & Barker (2011) discuss the phylogeny of the genus.

ID 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!).

Ref: Allred (1984); Allred (1985); Allred (1986); Allred (2003d) In Flora of North America Editorial Committee (2003a); Henrard (1929); Kesler, Anderson, & Hermann (2003); Peet (1993); Ward (2001). Show full citations.

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image of plant© Richard & Teresa Ware | Original Image ⭷
image of plant© Aidan Campos source | Original Image ⭷