Penstemon sepalulus
in J. M. Coulter and A. Nelson, New Man. Bot. Rocky Mt., 449. 1909. (as Pentstemon)
Herbs or subshrubs. Stems ascending to erect, 40–90 cm, glabrous, glaucous. Leaves cauline, opposite, glabrous, glaucous; cauline 6–14 pairs, sessile, 30–85(–102) × 3–13 mm, blade elliptic, base tapered, margins entire, apex acute. Thyrses interrupted, cylindric, 6–30 cm, axis glabrous, verticillasters (5–)8–14, cymes 1(or 2)-flowered, 2 per node; proximal bracts narrowly elliptic to linear, 8–45 × 1–8 mm; peduncles and pedicels ascending to erect, glabrous. Flowers: calyx lobes obovate to ovate or elliptic, 1.8–3.2 × 1.5–2.2 mm, glabrous or minutely ciliolate distally; corolla light lavender to violet or purple, with violet nectar guides, weakly ventricose, 22–26(–28) mm, glabrous externally, glabrous internally, tube 7–9 mm, throat gradually inflated, 7–9 mm diam., 2-ridged abaxially; stamens included or longer pair exserted, filaments glabrous, pollen sacs parallel to slightly divergent, 1.5–2 mm, distal 2/3 indehiscent, sides glabrous, sutures denticulate, teeth to 0.1 mm; staminode 15–16 mm, included, 0.5–0.6 mm diam., glabrous; style 16–20 mm. Capsules 7–10 × 4.5–5.5 mm.
Phenology: Flowering Jun–Aug.
Habitat: Rocky to gravelly and talus slopes, Gambel oak, maple, and aspen woodlands.
Elevation: 1200–2300 m.
Discussion
Penstemon sepalulus is found in the Wasatch Mountains in Juab, Sevier, Utah, and Washington counties.
Selected References
None.