Penstemon pseudospectabilis is a member of Penstemon subg. Penstemon sect. Peltanthera subsect. Spectabiles (Bennett et al. 1987). The bluish cast to the foliage is due to a waxy coat on the leaves (i.e., they are glaucous).|
Bennett, R. W., K. Lodewick, and R. Lodewick. 1987. Penstemon nomenclature. Eugene, OR: American Penstemon Society.
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