Oenothera argillicola Mackenzie. Phen: (Jun-) Jul-Oct. Hab: Shale barrens and woodlands. Dist: Sc. PA south through MD to e. WV and w. VA (south to Montgomery County).
Origin/Endemic status: Endemic
Synonymy: = C, F, FNA10, FNA10, G, K1, K3, K4, Pa, Va, W, WV, Dietrich, Wagner, & Raven (1997), Wagner, Hoch, & Raven (2007); > Oenothera argillicola Mack. var. argillicola – Munz (1965); > Oenothera argillicola Mack. var. pubescens Core & Davis – Munz (1965)