Penstemon putus

Stems ascending to erect, 20–45(–60) cm, glabrous, not glaucous. Leaves basal and cauline, leathery or not, glabrous, not glaucous; basal and proximal cauline 15–95 × 1–4(–5) mm, blade linear, base tapered, margins entire, apex acute to acuminate; cauline 5–7 pairs, sessile, 8–95 × 0.5–3(–4) mm, blade linear, base truncate, apex acute to acuminate. Thyrses interrupted, secund, 6–30 cm, axis glabrous, verticillasters 5–11, cymes 1–3-flowered, 1 or 2 per node; proximal bracts linear to subulate, (2–)3–30(–50) × 0.5–2 mm; peduncles and pedicels glabrous. Flowers: calyx lobes ovate, 2.2–4 × 1.3–3.5 mm, glabrous; corolla white to pink, lavender, or violet, with reddish purple nectar guides, ventricose, 18–22 mm, glabrous externally, sparsely white-lanate internally abaxially, tube 4–6 mm, throat gradually inflated, not constricted at orifice, 7–10 mm diam., rounded abaxially; stamens: longer pair exserted, pollen sacs opposite, navicular, 1.2–1.6 mm, dehiscing completely or incompletely, connective splitting or not, sides glabrous, sutures papillate or denticulate, teeth to 0.1 mm; staminode 11–14 mm, exserted, 0.4–0.7 mm diam., tip straight to recurved, glabrous; style 12–17 mm. Capsules 6–11 × 4–6 mm. 2n = 16.

Phenology: Flowering Jun–Sep.
Habitat: Rocky to sandy pine forests, pinyon-juniper woodlands.
Elevation: 1500–2600 m.

Ariz.

Discussion

Penstemon putus occurs primarily along the Mogollon Rim in central and east-central Arizona. Populations have been documented in Apache, Coconino, Gila, Navajo, and Yavapai counties.

Selected References

None.

Lower Taxa