Dusky Penstemon
Penstemon whippleanus

Family: Plantain (Plantaginaceae)
AKA: Whipple's Penstemon,  Dusky Beardtongue
Photo taken on: July 16, 2013
Location: Slumgullion Pass, CO;
Life Zones: Subalpine to alpine
Habitat: Slopes and trails

Grows to 2ft with leafy stems. Flowers are most commonly purple but can be cream colored.

Photo taken on: July 29, 2007 at Cottonwood Pass, CO

Flora of North America reference.