Rhodora 95: 414, fig. 21. 1993.
Stems ascending to erect, 4–25 cm, retrorsely ± hairy proximally, glandular-pubescent distally. Leaves basal and cauline, not leathery, glabrous abaxially, retrorsely hairy adaxially, usually only along midvein on distal caulines; basal and proximal cauline petiolate, 12–73 × 2–9 mm, blade spatulate to oblanceolate, base tapered, margins entire or obscurely dentate, apex rounded to obtuse or acute; cauline 3–5 pairs, sessile, 11–48 × 2–6 mm, blade lanceolate, base clasping, margins entire or dentate proximally, apex acute to acuminate. Thyrses interrupted or continuous, cylindric, 2–7 cm, axis glandular-pubescent, verticillasters 3–7, cymes 3–5-flowered, 2 per node; proximal bracts lanceolate, 7–28 × 2–6 mm; peduncles and pedicels glandular-pubescent. Flowers: calyx lobes lanceolate, 4.8–7.5 × 0.9–1.9 mm, glandular-pubescent; corolla blue to bluish lavender or light purple, with purple nectar guides, funnelform, 14–20 mm, yellow-lanate internally abaxially, tube 4–6 mm, throat gradually inflated, not constricted at orifice, 5–7 mm diam., rounded or slightly 2-ridged abaxially; stamens: longer pair reaching orifice or exserted, pollen-sacs parallel, navicular, 1.3–1.6 mm, dehiscing completely, sutures papillate; staminode 7–9 mm, included or reaching orifice, 0.7–0.9 mm diam., tip straight to recurved, distal 5–6 mm sparsely to densely pilose, hairs golden yellow, to 2 mm; style 8–10 mm. Capsules 6–10 × 3–5.5 mm.
Phenology: Flowering May–Jun.
Habitat: Sagebrush shrublands, grasslands.
Elevation: 1600–1800 m.
Penstemon franklinii is known only from Cedar Valley in Iron County. According to Welsh, morphology and geography suggest that the species is most closely related to P. pinorum.
"/4+timescorollathroat" is not declared as a valid unit of measurement for this property.