Penstemon laevigatus var. digitalis (Nutt.) A.Gray (1878)
Penstemon digitalis (known by the common names foxglove beard-tongue,[2]foxglove beardtongue, talus slope penstemon,[3] and white beardtongue[4]) is a species of flowering plant in the plantain family, Plantaginaceae. The flowers are white and are borne in summer. It is native to eastern Canada and the eastern and southeastern United States.[2]Penstemon digitalis is the most widespread species of Penstemon east of the Mississippi River.[5]
^"Penstemon digitalis Nutt. ex Sims". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 9 April 2024.
^ abDickinson, T.; Metsger, D.; Bull, J.; & Dickinson, R. (2004). ROM Field Guide to Wildflowers of Ontario. Toronto: Royal Ontario Museum, p. 332.
^USDA, NRCS (n.d.). "Penstemon digitalis". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved June 9, 2017.
^Newcomb, L. (1977). Newcomb's Wildflower Guide. Little, Brown and Company, p. 102.
^Cite error: The named reference wolfe was invoked but never defined (see the help page).
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