Penstemon parvus

Pennell

Contr. U.S. Natl. Herb. 20: 345. 1920.

Common names: Aquarius Plateau beardtongue
EndemicConservation concern
Treatment appears in FNA Volume 17. Treatment on page 175. Mentioned on page 156.

Stems decumbent to ascending, 6–20(–25) cm, retrorsely hairy or puberulent, not glaucous. Leaves basal and cauline, not leathery, retrorsely hairy, not glaucous; basal and proximal cauline 8–40(–60) × 2–7 mm, blade spatulate to oblanceolate, base tapered, margins entire, apex rounded to obtuse or acute; cauline 2–4 pairs, sessile, 10–38 × 1–6 mm, blade lanceolate, base tapered, apex acute. Thyrses continuous to ± interrupted, secund, (2–)4–9 cm, axis retrorsely hairy proximally, mostly glandular-pubescent distally, verticillasters (3 or)4–8, cymes 1- or 2-flowered, (1 or)2 per node; proximal bracts linear, 3–26 × 0.5–2.5 mm; peduncles and pedicels glandular-pubescent, peduncles also usually retrorsely hairy. Flowers: calyx lobes ovate, 3–4(–5) × 2–2.9 mm, glandular-pubescent; corolla blue to violet or purple, with reddish purple nectar guides, ventricose, 13–20 mm, glandular-pubescent externally, glabrous internally, tube 4.5–6 mm, throat gradually inflated, not constricted at orifice, 4–6(–8) mm diam., slightly 2-ridged abaxially; stamens included or longer pair reaching orifice, pollen sacs opposite, navicular, 1–1.4 mm, dehiscing incompletely, connective not splitting, sides glabrous, sutures papillate; staminode 8–10 mm, reaching orifice, 0.5–0.6 mm diam., tip straight, glabrous; style 11–15 mm. Capsules 7–8 × 6–7 mm.


Phenology: Flowering Jun–Aug.
Habitat: Sagebrush shrublands.
Elevation: 2600–3500 m.

Discussion

Penstemon parvus is known from the Aquarius Plateau in Garfield, Piute, and Sevier counties.

Selected References

None.

Lower Taxa

None.