Penstemon nudiflorus

A. Gray

Proc. Amer. Acad. Arts 20: 306. 1885. (as Pentstemon)

Common names: Flagstaff beardtongue
Endemic
Treatment appears in FNA Volume 17. Treatment on page 174. Mentioned on page 156, 157.

Stems erect, (35–)55–100 cm, glabrous, glaucous. Leaves basal and cauline, or basal absent or reduced, leathery, glabrous, glaucous; basal and proximal cauline 25–110 × (4–)10–27 mm, blade ovate to elliptic or lanceolate, base tapered, margins entire, apex obtuse to acute; cauline 3–6 pairs, sessile, (5–)15–105 × (1–)2–30 mm, blade lanceolate, base tapered to clasping, apex acute to acuminate. Thyrses interrupted, cylindric, 8–55 cm, axis glabrous, verticillasters 5–13, cymes 1- or 2(or 3)-flowered, (1 or)2 per node; proximal bracts lanceolate to subulate, 4–8 × 1–3 mm; peduncles and pedicels spreading to ascending, glabrous. Flowers: calyx lobes ovate to lanceolate, 4–5.8 × 2.5–3.2 mm, glabrous; corolla violet to lavender, with reddish purple nectar guides, ventricose-ampliate, 20–33 mm, glabrous externally, sparsely white-lanate internally abaxially, tube 7–9 mm, throat gradually to abruptly inflated, not constricted at orifice, 9–11 mm diam., rounded abaxially; stamens: longer pair exserted, pollen sacs opposite, navicular, 1.7–2.3 mm, dehiscing completely, sides glabrous, sutures denticulate, teeth to 0.1 mm; staminode 16–20 mm, reaching orifice or exserted, 0.5–0.8 mm diam., tip straight, distal 2–4 mm sparsely lanate, hairs yellow, to 1.5 mm; style 17–22 mm. Capsules 8–10 × 3–4 mm.


Phenology: Flowering May–Jun.
Habitat: Rocky, basaltic soils in pinyon-juniper woodlands.
Elevation: 1500–2300 m.

Discussion

Penstemon nudiflorus occurs mostly along the Mogollon Rim in central Arizona in Coconino, Gila, Mohave, Navajo, and Yavapai counties.

Selected References

None.

Lower Taxa

None.