Aristida curtissii (A. Gray ex S. Watson & Coulter) Nash. Curtiss's Three-awn. Phen: Jul-Oct. Hab: Roadsides, disturbed areas, bare eroding soil. Dist: ME west to WY, south to n. FL, AR, OK, and CO, perhaps largely or adventive east of the Mississippi River.

Origin/Endemic status: Native

Taxonomy Comments: See Allred (1986) for a discussion of the rationale for reducing A. curtissii to a variety of A. dichotoma. Cronquist (1991) reduces it to a variety of the more western A. basiramea Engelmann ex Vasey. For now, and for simplicity, I prefer to retain the two as species.

Synonymy: = G, HC, Il, K4, RAB, S, S13, Va; = Aristida basiramea Engelm. ex Vasey var. curtissii (A.Gray ex S.Watson & Coult.) Shinners – Ar, C; = Aristida dichotoma Michx. var. curtissii A.Gray – F, FlGr, FNA25, K1, K3, Pa, Tn, W, WH3, WV, Allred (1986); = n/a – Tat; < Aristida basiramea Engelm. ex Vasey – Tx

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Heliophily: 9