Oenothera spachiana Torrey & A. Gray. Spach's Evening-primrose. Phen: Apr-May. Hab: Prairies, open woodlands, sandy areas. Dist: Sw. AR and OK south to w. LA and e. TX; disjunct eastwards in MS and AL.
Origin/Endemic status: Native
Synonymy: = Ar, FNA10, K3, K4, NcTx, Tx, Wagner, Hoch, & Raven (2007); = Kneiffia spachiana (Torr. & A.Gray) Small – S13; = n/a – C
Heliophily: 9
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