Oenothera linifolia Nuttall. Threadleaf Sundrops, Flaxleaf Sundrops. Phen: May-Jul. Hab: Barrens, glades, dry openings, and fields. Dist: C. VA west to s. IL and se. KS, south to Panhandle FL and se. TX. Occurrences east of the Mississippi River may be mainly or entirely adventive. Belden et al. (2004) discuss the Virginia occurrence.

Origin/Endemic status: Native

Synonymy: = Ar, C, F, Fl4, FNA10, G, GrPl, Il, K1, K3, K4, NcTx, RAB, Tn, Tx, Va, W, WH3, Munz (1965), Straley (1977), Wagner, Hoch, & Raven (2007); = Peniophyllum linifolium (Nutt.) Pennell – S; > Oenothera linifolia Nutt. var. glandulosa Munz

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