Penstemon deustus is a member of Penstemon subg. Penstemon sect. Penstemon subsect. Deusti (Bennett et al. 1987). Its common name is Hot Rock Penstemon, and it is usually found growing in the cracks of rocks.|
Bennett, R. W., K. Lodewick, and R. Lodewick. 1987. Penstemon nomenclature. Eugene, OR: American Penstemon Society.
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