Penstemon richardsonii

Douglas ex Lindley

Bot. Reg. 13: plate 1121. 1828. (as Pentstemon)

Common names: Richardson’s beardtongue
Treatment appears in FNA Volume 17. Treatment on page 241. Mentioned on page 229, 242.

Subshrubs. Stems ascending to erect, 20–95 cm, retrorsely hairy, hairs pointed, not glaucous. Leaves cauline, opposite or subopposite, glabrate or retrorsely hairy, not glaucous; cauline 5–13 pairs, short-petiolate or sessile, 13–70 × 5–30 mm, blade ovate to lanceolate, base tapered, margins laciniate-dentate to irregularly laciniate-pinnatifid, apex obtuse to acute. Thyrses interrupted, cylindric, 2–25(–48) cm, axis densely glandular-pubescent, verticillasters 3–7(–15), cymes 2–7-flowered, 1 or 2 per node; proximal bracts lanceolate, 7–43 × 2–16 mm; peduncles and pedicels spreading, sparsely to densely glandular-pubescent. Flowers: calyx lobes ovate to lanceolate, 4–7 × 1.3–2.3 mm, glandular-pubescent; corolla bluish to lavender, or pinkish, with reddish purple nectar guides, ventricose-ampliate, 15–32 mm, glandular-pubescent externally, glabrous internally or sparsely to moderately white-lanate abaxially, tube 7–12 mm, throat gradually inflated, 5–14 mm diam., rounded abaxially; stamens: longer pair reaching orifice or exserted, filaments glabrous, pollen sacs parallel, 1.3–2 mm, distal 1/2 indehiscent, sides glabrous, sutures denticulate, teeth to 0.2 mm; staminode 16–23 mm, exserted, 0.3–0.8 mm diam., glabrous or distal 2–8 mm sparsely lanate, hairs yellow, to 2 mm; style 11–23 mm. Capsules 5–9 × 4–5 mm. 2n = 16.


Varieties 3 (3 in the flora).

Penstemon richardsonii consists of three weakly differentiated varieties that are partially sympatric on the eastern slope of the Cascade Range.

The Okanagan-Coville tribe of northeastern Washington and the Paiute tribe of the Great Basin region used Penstemon richardsonii as a drug plant to treat typhoid fever and as a dermatological aid (D. E. Moerman 1998).

Selected References



1 Corollas 15–20 mm; styles 11–15 mm; staminodes glabrous or sparsely hairy distally. Penstemon richardsonii var. curtiflorus
1 Corollas 22–32 mm; styles 16–23 mm; staminodes with distal 2–8 mm sparsely lanate, rarely glabrous. > 2
2 Leaf blades ovate to lanceolate (in outline), margins laciniate-dentate to irregularly laciniate-pinnatifid. Penstemon richardsonii var. richardsonii
2 Leaf blades ovate, sometimes lanceolate, margins dentate, rarely laciniate-dentate. Penstemon richardsonii var. dentatus