Species Identification

Interested in the identification of penstemons? Please select a species then click on submit:

AttributeThe current selection is Penstemon_yampaensis
ClassificationPenstemon Penstemon Ericopsis Caespitosi
GeneralYampa River Penstemon Similar to P. acaulis but slightly larger and flowers more lilac than blue in color. Blooms: June
Anther0.8-1 mm long, opening full length, but not flat, becoming widely spreading, smooth except for the nipple-shaped cell edges.
StaminodeGolden-yellow-bearded; fertile stamens with one pair projecting.
Leaves1.3-2.5 cm (1/2-7/8 long & 1.2-3 mm wide, oblanceolate to narrowly oblanceolate, tapering to a long, narrowly winged (widened at base) petiole (stem), the edges usually entire, obtuse tips.
Stems: Low, cespitose, essentially stemless, perennial forming mats up to 30 cm (12) across by short stolons, herbage scabrous (rough to touch), the hairs blunt, papilliform (nipple-shaped), erect, viscid (sticky), flowering stems.
Inflorescense2-6 flowers, subsessile (short stems), the flowers included in the foliage.
Corolla11-16 mm 3/8-1/2) long, blue to lilac, the throat only weakly 2-ridged above, glandular-puberulent (tacky-downy) externally, the palate golden-yellow-to whitish-bearded, the upper lobes arched-erect, the lower lobes spreading.
Flower Color
Calyx5.5-7.5 mm long, the segments lanceolate, viscid-pubescent (sticky-hairy) as well as scabrous, and the edges green.
HabitatDry shaly-clay and sandy soils with sparse vegetation of pinyon-juniper, sagebrush, and shadscale, 1890-2070 m (6200-6700).
RangeEndemic to small area from Daggett Co., UT (Clay Basin and Browns Park) and Moffat Co., CO, to near Elk Springs and Maybell.