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Oenothera glauca Michaux. Glaucous Sundrops. Phen: May-Aug. Hab: Cliffs, rocky streambanks, moist forests over sedimentary rock. Dist: Cumberland Plateau and Ridge and Valley of KY, TN, and GA.

ID notes:Very distinctive and unlikely to be confused with any other members of the complex; glabrous throughout, strongly glaucous on leaves and inflorescence.

Origin/Endemic status: Endemic

Synonymy: = Kneiffia glauca (Michx.) Spach – S; < Oenothera fruticosa L. ssp. glauca (Michx.) Straley – K1, K3, Pa, W, Straley (1977); < Oenothera fruticosa L. ssp. tetragona (Roth) W.L.Wagner – FNA10, K4, NY, Wagner (2014); < Oenothera tetragona Roth – C, Tn, Va; < Oenothera tetragona Roth ssp. glauca (Michx.) Munz – Munz (1965)

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Heliophily: 5

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