Brittonia 37: 321, figs. 1, 2. 1985.
Herbs. Stems ascending to erect, (5–) 8–23 cm, glabrous, not glaucous. Leaves cauline, opposite, glabrous abaxially, glabrate or retrorsely hairy adaxially, hairs appressed, white, scalelike, not glaucous; cauline 2–6 pairs, sessile or proximals short-petiolate, 13–70 × (3–) 7–17 mm, blade elliptic to lanceolate, base tapered, margins entire, apex obtuse to acute. Thyrses continuous, cylindric, (1–) 2–12 cm, axis glabrous, verticillasters (2 or) 3–7, cymes 3–5-flowered, 2 per node; proximal bracts lanceolate, 14–45 × 2–12 mm; peduncles and pedicels ascending to erect, glabrous or pedicels ± puberulent, hairs appressed, white, scalelike. Flowers: calyx lobes ovate, (4–) 5–6.3 × 1.5–2.6 mm, glabrous or ± scabrous proximally; corolla violet to light blue, without nectar guides, abaxial ridges usually white, ventricose, 24–32 mm, glabrous externally, glabrous internally, tube 7–10 mm, throat gradually inflated, 8–13 mm diam., 2-ridged abaxially; stamens: longer pair reaching orifice or exserted, filaments glabrous, pollen-sacs parallel, 2.4–2.8 mm, distal 1/2–2/3 indehiscent, sides glabrous, sutures denticulate, teeth to 0.1 mm; staminode 15–18 mm, included, 0.4–0.7 mm diam., glabrous; style 18–27 mm. Capsules 7–9 × 5–6 mm.
Phenology: Flowering May–Jun.
Habitat: Rocky alluvium, talus slopes, desert scrub, juniper woodlands.
Elevation: 1300–2300 m.
Penstemon floribundus is known only from the Jackson Mountains in Humboldt County.
"/4+timescorollathroat" is not declared as a valid unit of measurement for this property.