Penstemon alluviorum Pennell. Lowland Beardtongue. Phen: May-Jun. Hab: Bottomland forests and fields. Dist: S. OH, s. IN, s. IL, and e. MO south to TN, AL, MS, and ne. AR.
Origin/Endemic status: Endemic
Synonymy: = F, G, Il, K1, K3, K4, S, Tn, Clements, Baskin, & Baskin (1998), Estes (2012), Pennell (1935); < Penstemon digitalis Nutt. ex Sims – C, FNA17; < Penstemon laevigatus Aiton ssp. alluviorum (Pennell) R.W.Benn. var. alluviorum – Bennett (1963)
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