Penstemon alamosensis

Stems ascending to erect, 14–120 cm, sometimes glaucous. Leaves not leathery, glabrous, sometimes glaucous; basal and proximal cauline 25–140 × 9–45 mm, blade elliptic to obovate or lanceolate, base tapered, margins entire, apex obtuse to acute; cauline 2–6 pairs, sessile or proximals short-petiolate, 10–135 × 3–30 mm, blade oblong to oblanceolate or lanceolate, base tapered to truncate, margins entire, apex obtuse to acute. Thyrses interrupted, cylindric to ± secund, 12–34(–90) cm, axis glabrous, verticillasters 5–15(–30), cymes (1 or)2(–4)-flowered; proximal bracts lanceolate to subulate, 4–15 × 1–5 mm; peduncles and pedicels ascending to erect, peduncles glabrous, pedicels glabrous or sparsely glandular-pubescent. Flowers: calyx lobes lanceolate, 3–4.5 × 1–1.5 mm, margins entire, sparsely glandular-pubescent; corolla red to orangish red, without nectar guides, nearly radially symmetric, weakly bilabiate, tubular-funnelform, 19–25 mm, glandular-pubescent externally, glandular-pubescent internally abaxially, tube 6–8 mm, throat gradually inflated, 5–7 mm diam., rounded abaxially; stamens included, pollen sacs explanate, 1–1.4 mm, sutures smooth; staminode 7–9 mm, flattened distally, 0.3–0.5 mm diam., tip straight to recurved, glabrous; style 9–11 mm. Capsules 11–16 × 5–8 mm. 2n = 16.

Phenology: Flowering Apr–Jun.
Habitat: Limestone canyons, cliffs, and slopes.
Elevation: 1300–1600 m.

N.Mex., Tex.

Discussion

Penstemon alamosensis is known from the Sacramento and San Andres mountains in New Mexico (Doña Ana, Lincoln, and Otero counties) and in the Hueco Mountains in western Texas (El Paso County).

Selected References

None.

Lower Taxa