Oenothera grandis (Britton) Smyth. Showy Ragged Evening-primrose. Phen: Mar-Jul (-Sep). Hab: Upland prairies, roadsides, other disturbed (especially sandy) areas. Dist: IL, MO, and NE south to LA, TX, NM, and Mexico (DGO, MIC, TAM).
Origin/Endemic status: Native
Synonymy: = Ar, FNA10, GrPl, Il, K1, K3, K4, Mex, NcTx, NY, Tx, WH3, Dietrich & Wagner (1988), Munz (1965), Wagner, Hoch, & Raven (2007); = n/a – C; = Oenothera laciniata Hill var. grandiflora (S.Watson) B.L.Rob. – F, G, RAB
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