Great Basin Naturalist 46: 459. 1986.
Stems ascending to erect, 2–6(–8) cm, pubescent or densely retrorsely hairy. Leaves basal and cauline, not leathery, retrorsely hairy; basal and proximal cauline petiolate, 8–30 × 2–9 mm, blade spatulate to oblanceolate, base tapered, margins entire, apex rounded to obtuse or acute; cauline (0 or)1–3 pairs, sessile, 14–23 × 1–4 mm, blade oblanceolate to linear, not arcuate, base tapered, margins entire, apex acute. Thyrses continuous, cylindric, 1–4 cm, axis puberulent or retrorsely hairy, verticillasters 1–5, cymes (1 or)2-flowered, 2 per node; proximal bracts oblanceolate to lanceolate or linear, 13–24 × 1–4 mm; peduncles and pedicels retrorsely hairy, sometimes sparsely glandular-pubescent. Flowers: calyx lobes lanceolate, 5–8.5 × 1–2.1 mm, retrorsely hairy, sometimes sparsely glandular-pubescent; corolla light blue to blue, lavender, or violet, without nectar guides, funnelform, 14–20 mm, glabrous or sparsely white-lanate internally abaxially, tube 6–8 mm, throat gradually inflated, not constricted at orifice, 4–7 mm diam., slightly 2-ridged abaxially; stamens included or longer pair reaching orifice, pollen sacs opposite, navicular, 0.9–1.2 mm, dehiscing completely, sutures papillate; staminode 9–11 mm, included or reaching orifice, 0.5–1.1 mm diam., tip straight to recurved, distal 5–7 mm moderately pubescent to lanate, hairs yellow or yellow-orange, to 1.5 mm; style 9–12 mm. Capsules 4–6.5 × 4–5 mm.
Phenology: Flowering May–Jun.
Habitat: Gravelly, sandy, and clayey hills, sagebrush shrublands, pinyon-juniper woodlands.
Elevation: 1500–2000 m.
Penstemon duchesnensis is known only from the western Uinta Basin in the vicinity of Duchesne, Duchesne County.