Penstemon tenuiflorus, commonly known as eastern whiteflower beardtongue, is a species of flowering plant in the plantain family. It is native only to a small area of the Southeastern United States, in the southern Interior Low Plateau and Black Belt of Alabama and Mississippi. Its preferred habitat is limestone glades and woodlands.The Comparative Biology of the Two Related Species Penstemon tenuiflorus Pennell and P. hirsutus (L.) Willd. (Scrophulariaceae, Section Graciles): IV. Effects of Shade, Drought, and Soil Type on Survival and Growth Richard K. Clements, Jerry M. Baskin and Carol C. Baskin Castanea, Vol. 67, No. 2 (Jun., 2002), pp. 177-187
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