Penstemon diphyllus

Penstemon diphyllus, the twin-leaved penstemon, is a species in the veronica family from the northwestern United States in Washington, Idaho, and Montana.

Taxonomy Penstemon diphyllus was scientifically described and named in 1900 by Per Axel Rydberg. He placed the species in the Penstemon genus which is classified in the Plantaginaceae family. Though listed as an accepted species by Plants of the World Online, it was described as a subspecies of Penstemon triphyllus by David D. Keck in 1932. The species has no subspecies.

Names Penstemon diphyllus is known by the common names twin-leaved penstemon, twoleaf beardtongue, and less frequently mintleaf penstemon.

Range and habitat Twin-leaved penstemons are native to the US states of Washington, Idaho, and Montana. In Washington state it is only recorded as occurring in Whitman County on the eastern edge of the state. It grows in many of the counties in central Idaho, but only in counties along the Western edge of Montana. It occurs at elevations of .

Penstemon diphyllus

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