Notul. Nat. Acad. Nat. Sci. Philadelphia 71: 10. 1941.
Herbs. Stems ascending to erect, 26–45 cm, glabrous, glaucous. Leaves basal and cauline, ± leathery or not, glabrous, glaucous; basal and proximal cauline 15–60 × 7–13 mm, blade spatulate to elliptic, base tapered, margins entire, apex rounded to obtuse or acute; cauline 2–4 pairs, sessile or proximals short-petiolate, 26–55 × 7–14 mm, blade oblanceolate to oblong or lanceolate, base truncate to clasping, margins entire, apex obtuse to acute. Thyrses interrupted, cylindric, 8–22 cm, axis glandular-pubescent, verticillasters 2–8, cymes 3–6-flowered, 2 per node; proximal bracts lanceolate, 16–40 × 2–14 mm, margins entire; peduncles and pedicels ascending to erect, pedicels glandular-pubescent, sometimes peduncles glabrous. Flowers: calyx lobes ovate to lanceolate, 2.4–5.5 × 1–2 mm, glandular-pubescent; corolla violet, without nectar guides, tubular-funnelform, 12–15 mm, glandular-pubescent externally, moderately yellow-pilose internally abaxially, tube 3–4 mm, throat slightly inflated, 3.5–5 mm diam., 2-ridged abaxially; stamens included, pollen sacs opposite, navicular, 0.7–1 mm, dehiscing completely, connective splitting, sides glabrous, sutures papillate; staminode 6–8 mm, included, 0.3–0.5 mm diam., tip straight to slightly recurved, distal 1–2 mm densely pilose, hairs golden yellow, to 0.5 mm, or glabrous; style 8–10 mm. Capsules 5–7 × 3–4 mm, glabrous.
Phenology: Flowering Jun–Aug.
Habitat: Clearings in pine and pine-fir forests.
Elevation: 1900–2100 m.
Penstemon glaucinus is known only from Klamath and Lake counties.