Penstemon pinifolius

Illustrator: John Myers

Copyright: Flora of North America Association

Stems erect, (5–)10–50 cm, glabrous or retrorsely hairy, hairs pointed. Leaves leathery, sparsely retrorsely hairy, hairs pointed, especially along margins, or glabrous; cauline 10–30 pairs, sessile, 4–32 × 0.5–1.2 mm, blade linear, base tapered to clasping, apex acuminate. Thyrses interrupted, secund, (1–)3–15 cm, axis retrorsely hairy to puberulent, or glabrous, verticillasters 1–7, cymes 1–3-flowered, 1(or 2) per node; proximal bracts linear, 3–14 × 0.3–1 mm; peduncles and pedicels ascending to erect, glandular-pubescent, sometimes puberulent. Flowers: calyx lobes lanceolate, 5–7 × 1.5–2 mm, scarious-margined, glandular-pubescent, hairs pointed; corolla scarlet, throat sometimes yellow or yellow- or orange-spotted, unlined internally, salverform, 25–32 mm, yellow-lanate internally abaxially, tube 4–6 mm, throat slightly inflated, 4–5 mm diam., slightly 2-ridged abaxially; stamens exserted (often hidden by galeate adaxial lobes), filaments glabrous, pollen sacs opposite, explanate, 0.8–1 mm, sutures smooth; staminode 12–17 mm, included, slightly flattened distally, 0.1–0.2 mm diam., tip straight, distal 9–10 mm densely pilose, hairs yellow, to 1.3 mm; style 21–27 mm. Capsules 5–9 × 3–4 mm. 2n = 16.

Phenology: Flowering Jun–Jul(–Sep).
Habitat: Rocky slopes, cliffs.
Elevation: 1800–3100 m.

Distribution

• Generated Map
• Legacy Map

Ariz., N.Mex., Mexico (Chihuahua, Sonora).

Discussion

Penstemon pinifolius has been included as an anomalous member of sect. Leptostemon Trautvetter; R. M. Straw (1962) expressed doubt about that association. It was allied with members of sect. Caespitosi in the molecular study by A. D. Wolfe et al. (2006).

Selected References

None.

Lower Taxa

None.