Penstemon tiehmii

N. H. Holmgren

Brittonia 50: 159, fig. 1F–J. 1998.

Common names: Shoshone or Tiehm’s beardtongue
EndemicConservation concern
Treatment appears in FNA Volume 17. Treatment on page 244. Mentioned on page 230, 231.

Herbs. Stems ascending to erect, 6–20 cm, retrorsely hairy, hairs appressed, white, ± scalelike, not glaucous. Leaves cauline, opposite, retrorsely hairy, hairs white, scalelike, not glaucous; cauline 1–4 pairs, petiolate, 15–45 × 7–24 mm, blade ovate to spatulate or lanceolate, base tapered, margins entire, apex rounded to acute. Thyrses interrupted, cylindric, 2–7 cm, axis glandular-pubescent, sometimes also retrorsely hairy or appressed-hairy proximally, hairs white, scalelike, verticillasters 3 or 4(–7), cymes (1 or)2–5-flowered, 1 or 2 per node; proximal bracts lanceolate, 9–25 × 1–5 mm; peduncles and pedicels ascending, glandular-pubescent. Flowers: calyx lobes lanceolate, 4–4.8 × 1.4–2 mm, glandular-pubescent; corolla violet to lavender, without nectar guides, abaxial ridges usually white, weakly ventricose, 15–20 mm, glandular-pubescent externally, glabrous internally, tube 4–6 mm, throat gradually inflated, 4–5 mm diam., 2-ridged abaxially; stamens included or longer pair reaching orifice, filaments glabrous, pollen sacs nearly parallel to divergent, 1.1–1.6 mm, distal 2/3 indehiscent, sides glabrous, sutures denticulate, teeth to 0.1 mm; staminode 8–10 mm, exserted, 0.3–0.6 mm diam., glabrous or sparsely pilose, hairs yellow, to 0.2 mm; style 10–13 mm. Capsules 6–8 × 4–5 mm. 2n = 16.

Phenology: Flowering Jun–Aug.
Habitat: Sandy-loam soils, steep volcanic talus slopes.
Elevation: 2300–2900 m.


Penstemon tiehmii is known only from Mount Lewis in the Shoshone Range in Lander County.

Selected References


Lower Taxa