Penstemon sepalulus

A. Nelson

in J. M. Coulter and A. Nelson, New Man. Bot. Rocky Mt., 449. 1909. (as Pentstemon)

Common names: Little-cup beardtongue
Endemic
Basionym: Penstemon azureus var. ambiguus A. Gray in A. Gray et al., Syn. Fl. N. Amer. 2(1): 272. 1878
Treatment appears in FNA Volume 17. Treatment on page 243. Mentioned on page 230, 244.

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.

Lower Taxa

None.
... more about "Penstemon sepalulus"
Craig C. Freeman +
A. Nelson +
Penstemon azureus var. ambiguus +
Little-cup beardtongue +
1200–2300 m. +
Rocky to gravelly and talus slopes, Gambel oak, maple, and aspen woodlands. +
Flowering Jun–Aug. +
in J. M. Coulter and A. Nelson, New Man. Bot. Rocky Mt., +
Penstemon subg. Saccanthera +
Penstemon sepalulus +
Penstemon sect. Saccanthera +
species +