Great Basin Naturalist 35: 378. 1976.
Stems ascending to erect, 14–35(–50) cm, glabrous or sparsely retrorsely hairy proximally, usually sparsely glandular-pubescent distally. Leaves basal and cauline, leathery or not, glabrous or sparsely retrorsely hairy proximally adaxially; basal and proximal cauline petiolate, 30–80(–100) × 6–12 mm, blade oblanceolate to lanceolate, base tapered, margins entire or obscurely serrate, apex obtuse to acute or mucronate; cauline 3 or 4 pairs, sessile, 28–78 × 3–7 mm, blade oblanceolate to lanceolate, base attenuate to clasping, margins entire, apex obtuse to acute. Thyrses interrupted, cylindric, (3–)7–24 cm, axis glandular-pubescent, verticillasters 3–8, cymes 3–12-flowered, 2 per node; proximal bracts lanceolate to linear, 22–65 × 2–10 mm; peduncles and pedicels glandular-pubescent. Flowers: calyx lobes lanceolate, 6–8(–9) × 1.5–2 mm, glandular-pubescent; corolla blue to lavender, with dark violet nectar guides, bilabiate, tubular-funnelform, 10–13 mm, sparsely to moderately yellow-lanate internally abaxially, tube 4–5 mm, throat gradually inflated, not constricted at orifice, 3–5 mm diam., rounded abaxially; stamens reaching orifice or longer pair exserted, pollen sacs opposite, navicular, 0.9–1.5 mm, dehiscing completely, sutures papillate; staminode 6–8 mm, exserted, 0.3–0.4 mm diam., tip straight, distal 4–5 mm moderately to densely retrorsely-pubescent, hairs golden yellow, to 0.6 mm; style 6–8 mm. Capsules 8–12 × 4–7 mm.
Phenology: Flowering May–Jun.
Habitat: Pinyon-juniper woodlands.
Elevation: 1600–2400 m.
According to Welsh, Penstemon atwoodii is known only from the Kaiparowits Plateau of eastern Garfield and Kane counties.