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Craig C. Freeman +
(D. D. Keck) Cronquist +
Penstemon richardsonii subsp. dentatus +
300–1500 m. +
Talus slopes, cliffs, crevices, often in basalt. +
Flowering May–Aug(–Sep). +
in C. L. Hitchcock et al., Vasc. Fl. Pacif. N.W. +
Penstemon subg. Saccanthera +
Penstemon richardsonii var. dentatus +
Penstemon richardsonii +
variety +