Penstemon tenuiflorus Pennell. Phen: Apr-Jun. Hab: Dry woodlands, glades, prairies, barrens, cliffs, especially over limestone or other calcareous rocks. Dist: Endemic to the Interior Low Plateau of wc. KY, c. TN, n. AL, extending slightly into the Coastal Plain to the west, and disjunct in the Black Belt of AL and MS.
Origin/Endemic status: Endemic
Synonymy: = C, F, FNA17, G, K1, K3, K4, S, Tn, Clements, Baskin, & Baskin (1998), Estes (2012), Pennell (1935)