Penstemon pruinosus

Douglas ex Lindley

Edwards’s Bot. Reg. 15: plate 1280. 1829. (as Pentstemon pruinosum)

Common names: Chelan beardtongue
Treatment appears in FNA Volume 17. Treatment on page 218. Mentioned on page 189.

Herbs. Stems ascending or erect, 8–40(–60) cm, glabrate, retrorsely hairy, or glandular-pubescent, not glaucous. Leaves basal and cauline, not leathery, retrorsely hairy or pubescent, sometimes also glandular-pubescent; basal and proximal cauline 25–100(–150) × (4–)9–20(–34) mm, blade elliptic to ovate, base tapered, margins ± serrate to dentate, apex obtuse to acute; cauline 2–5 pairs, sessile, 11–60 × 5–25(–30) mm, blade triangular-ovate to lanceolate, base truncate to cordate-clasping, margins serrate to dentate, apex acute, rarely obtuse. Thyrses interrupted, cylindric, 4–28 cm, axis densely glandular-pubescent, rarely sparsely glandular-pubescent, verticillasters 3–8, cymes 3–11-flowered, 2 per node; proximal bracts ovate to lanceolate, 8–58 × 4–25 mm, margins serrate, sometimes entire; peduncles and pedicels ascending to erect, densely glandular-pubescent. Flowers: calyx lobes ovate to lanceolate, 2.5–4.5(–6) × 0.9–1.5 mm, glandular-pubescent; corolla blue to lavender, purple, or violet, with purple nectar guides, funnelform, 11–16 mm, glandular-pubescent externally, sparsely white-villous internally abaxially, tube 4–5 mm, throat gradually inflated, 3–6 mm diam., rounded abaxially; stamens included or longer pair reaching orifice, pollen sacs opposite, navicular to subexplanate, 0.6–0.8 mm, dehiscing completely, connective splitting, sides glabrous, sutures smooth; staminode 7–9 mm, included or slightly exserted, 0.2–0.3 mm diam., tip recurved, distal 0.5–1 mm densely pilose, hairs yellow, to 0.8 mm; style 8–10 mm. Capsules 4–7 × 3–4 mm, glabrous. 2n = 16.

Phenology: Flowering Apr–Jul.
Habitat: Open grassy, sandy, gravelly, and rocky slopes, pine and pine-fir woodlands, sagebrush shrublands.
Elevation: 300–2000 m.


Penstemon pruinosus occurs along the eastern slope of the Cascade Range in Chelan, Douglas, Grant, and Kittitas counties, Washington, east into the scablands of Adams and Franklin counties, Washington, and north into extreme southern British Columbia.

A blue dye is made from the flowers of Penstemon pruinosus by the Okanagan-Coville tribe of northeastern Washington (D. E. Moerman 1998).

Selected References


Lower Taxa

... more about "Penstemon pruinosus"
Craig C. Freeman +
Douglas ex Lindley +
Chelan beardtongue +
B.C. +  and Wash. +
300–2000 m. +
Open grassy, sandy, gravelly, and rocky slopes, pine and pine-fir woodlands, sagebrush shrublands. +
Flowering Apr–Jul. +
Edwards’s Bot. Reg. +
Penstemon pruinosus +
Penstemon sect. Penstemon +
species +