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Abstract
Rocky Mountain penstemon, a member of the Figwort family (Schrophulariaceae) is a semi-evergreen, native, perennial forb with fibrous roots and is 35-70 cm tall. Plants are mostly glabrous and the leaves are entire. Basal and lower leaves are 5-15 cm long, 5-16 mm wide, narrowly oblanceolate, rounded at the tip and tapering to the base. The upper leaves are 4-10 cm long, 2-7 mm wide, linear and often folded. The flower stalks have a whorl of 1 or 2 flowers (sometimes 4) at each node. The sepals are 3-5 mm long, glabrous and ovate or rounded to obtuse and are glabrous. The petals are 24-32 mm long and the flower tube is 6-10 mm long, deep blue in color with a whitish color at the opening and often with red-violet lines inside the throat and sparsely bearded to sometimes glabrous. The fruit is a capsule 8-13 mm long (Cronquist et. al., 1984).
Citation
Ogle, Daniel G.; Peterson, J. Scott; St. John, Loren. 2013. Plant guide: Rocky Mountain penstemon (Penstemon strictus) [Revised 2014]. Aberdeen, ID: U.S. Department of Agriculture, Natural Resources Conservation Service, Plant Materials Center. 4 p.
