Brittonia 8: 248. 1957.
Stems ascending to erect, 25–80 cm, retrorsely hairy, not glaucous. Leaves basal and cauline, not leathery, retrorsely hairy, not glaucous; basal and proximal cauline (35–) 50–160 × (5–) 8–24 mm, blade oblanceolate to lanceolate, base tapered, margins entire, apex obtuse to acute; cauline 4–8 pairs, short-petiolate or sessile, 25–85 (–125) × 6–15 mm, blade elliptic to lanceolate, base tapered to truncate, apex acute, rarely obtuse. Thyrses interrupted or continuous, cylindric, 7–30 cm, axis retrorsely hairy proximally, mostly glandular-pubescent distally, verticillasters 3–7 (–9), cymes 2–8 (–10) -flowered, 2 per node; proximal bracts lanceolate, 18–95 × 5–20 mm; peduncles and pedicels retrorsely hairy. Flowers: calyx lobes ovate to lanceolate, (4.8–) 6–11 × 2.2–3.5 mm, margins erose, glabrous or sparsely glandular, sometimes also sparsely puberulent; corolla violet to blue, without nectar guides, ventricose, 25–35 mm, glabrous externally, glabrous internally, tube 7–10 mm, throat gradually inflated, not constricted at orifice, 7–11 mm diam., 2-ridged abaxially; stamens included, pollen-sacs divergent to nearly opposite, sigmoid, 1.8–2.2 mm, dehiscing incompletely, proximal 1/5–1/4 indehiscent, connective not splitting, sides sparsely hispid, hairs white, to 0.3 mm, sutures denticulate, teeth to 0.1 mm; staminode 14–16 mm, included, 0.7–0.8 mm diam., tip straight, glabrous; style (11–) 15–22 mm. Capsules 8–11 × 5–6 mm.
Phenology: Flowering Jun–Jul.
Habitat: Montane grasslands, sagebrush shrublands, pine and pine-fir woodlands.
Elevation: 1200–2500 m.
Penstemon lemhiensis is known from the Central Rocky Mountains in east-central Idaho (Lemhi County) and southwestern Montana (Beaverhead, Deer Lodge, Ravalli, and Silver Bow counties).
"/4+timescorollathroat" is not declared as a valid unit of measurement for this property.