Penstemon scariosus

Penstemon scariosus is a species of flowering plant in the plantain family known by the common name White River beardtongue. It is native to Colorado, Utah, and Wyoming in the United States.Penstemon scariosus. The Nature Conservancy. There are four varieties of this species, including var. albifluvis (White River beardtongue), var. cyanomontanus (Neese's Blue Mountain beardtongue), and var. garrettii (Garrett's beardtongue).Penstemon scariosus. USDA Plants Profile. The var. albifluvis is a rare variety limited to northeastern Utah and northwestern Colorado. It is up to 30 centimeters tall and produces lavender or light blue flowers.var. albifluvis. Center for Plant Conservation. The flowers are pollinated by bees.Lewinsohn, J. S., et al. (2007). Breeding biology and flower visitors of the rare White River pentstemon, Penstemon scariosus var. albifluvis (Scrophulariaceae). Western North American Naturalist 67(2):232-237. This variety is a candidate for federal protection because it grows on oil shale, a common source of petroleum.var. albifluvis. USDA NRCS Plant Guide.

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