Penstemon flowersii
Great Basin Naturalist 43: 429, fig. 1. 1983.
Stems ascending to erect, 8–25(–32) cm, glabrous. Leaves essentially cauline, basal usually reduced or absent, glabrous; proximal cauline (15–)20–55 × (4–)10–25 mm, blade spatulate to lanceolate, base tapered, apex rounded to obtuse or acute; cauline 4–6 pairs, short-petiolate or sessile, 30–58 × 9–26 mm, blade ovate to elliptic or lanceolate, base tapered to clasping, apex obtuse to acute. Thyrses ± interrupted, cylindric, 8–14 cm, axis glabrous, verticillasters 4–9, cymes 1–5-flowered; proximal bracts ovate, 16–44 × 6–24 mm; peduncles and pedicels glabrous. Flowers: calyx lobes lanceolate, 5–6.5 × 1.9–3 mm, margins entire or erose, broadly scarious, glabrous; corolla pink, with rose pink nectar guides, tubular-funnelform, 15–18 mm, glabrous externally, glabrous internally, tube 5–6 mm, throat gradually inflated, 4–5 mm diam., rounded abaxially; stamens included, pollen sacs opposite, 1–1.2 mm, sutures smooth; staminode 8–9 mm, reaching orifice, 0.7–0.8 mm diam., tip recurved, distal 0.5–1.5 mm sparsely lanulose, hairs yellow, to 0.6 mm; style 14–16 mm. Capsules 7–10 × 5–8 mm.
Phenology: Flowering May–Jun.
Habitat: Shaley and clayey soils, shadscale shrublands.
Elevation: 1500–1600 m.
Discussion
Penstemon flowersii is known from a 200 square km area of the Duchesne River drainage between Myton and Randlett in Duchesne and Uintah counties. According to Neese and Welsh, plants grow on slopes and benches of the Uinta Formation.
Selected References
None.