Oenothera triloba Nuttall. Stemless Evening-primrose. Phen: (Feb-) Mar-Jun (-Jul). Hab: Limestone glades, blackbelt prairies, playas, floodplains; eastwards also in disturbed areas. Dist: MO and KS south through AR, OK, and e. NM to ne. LA, TX, and n. Mexico (BCN, CHH, COA, NLE, TAM); also scattered east of the Mississippi River in both native and apparently introduced populations.

Origin/Endemic status: Native

Synonymy: = Ar, C, F, FNA10, G, GrPl, H, Il, K1, K3, K4, Mex, NcTx, NY, Pa, Tn, Tx, Munz (1965), Wagner, Hoch, & Raven (2007); = Lavauxia triloba (Nutt.) Spach – S

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