Oenothera macrocarpa Nuttall ssp. oklahomensis (Norton) W.L. Wagner. Oklahoma Sundrops. Phen: Apr-Jun. Hab: In rocky or clayey areas. Dist: S. KS through OK to nc. TX.
Origin/Endemic status: Native
Synonymy: = FNA10, GrPl, K3, K4, NcTx; < Oenothera missouriensis Sims – F, Tx
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