Penstemon putus

A. Nelson

Univ. Wyoming Publ. Sci., Bot. 1: 131. 1926.

Common names: Black River beardtongue
Synonyms: Penstemon virgatus subsp. putus (A. Nelson) Crosswhite
Treatment appears in FNA Volume 17. Treatment on page 177. Mentioned on page 146, 157, 182, 183.

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.


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


Lower Taxa