Penstemon floridus

Herbs. Stems ascending or erect, 50–120 cm, glaucous. Leaves: basal and proximal cauline 45–80(–100) × 15–30(–40) mm, blade obovate to ovate, oblanceolate, or lanceolate, base tapered, margins coarsely dentate, apex obtuse to acute; cauline 6–9 pairs, sessile or proximals short-petiolate, 50–100 × (8–)20–45 mm, blade ovate to lanceolate, base cordate-clasping or tapered, margins coarsely dentate, apex acute, sometimes obtuse. Thyrses interrupted, secund, 30–80 cm, axis glabrous or sparsely glandular-pubescent distally, verticillasters 9–19, cymes 1–5-flowered; proximal bracts lanceolate, 10–55 × 2–30 mm; peduncles and pedicels ascending to erect, glandular-pubescent. Flowers: calyx lobes ovate, 4.2–6 × 2–3 mm, glandular-pubescent; corolla lavender to light pink, rose pink, or light yellow, with reddish nectar guides, strongly bilabiate, ventricose, 21–32 mm, glandular-pubescent externally, glandular-pubescent internally, tube 6–12 mm, length 2–2.2 times calyx lobes, throat gradually to abruptly inflated, constricted or slightly so at orifice, 6–16 mm diam., rounded abaxially; stamens included, filaments glabrous, pollen sacs explanate, 1.4–1.8 mm, sutures smooth; staminode 16–19 mm, included, 0.7–0.9 mm diam., tip straight, glabrous; style 15–20 mm, glabrous. Capsules 8–13 × 4–7 mm, glabrous. 2n = 16.

Distribution

w United States.

Discussion

Varieties 2 (2 in the flora).

The two varieties of Penstemon floridus are sympatric in the southern Silver Peak Range and southern White Mountains, where they apparently hybridize and introgress (N. H. Holmgren 1984).

Selected References

None.

Lower Taxa

Penstemon floridus var. austinii, Penstemon floridus var. floridus

Key

1	Corollas 24–32 mm, tubes 7–12 mm, throats abruptly inflated, constricted at orifices, (10–)11–16 mm diam.	Penstemon floridus var. floridus
1	Corollas 21–27 mm, tubes 6–9 mm, throats gradually inflated, slightly constricted at orifices, 6–10(–11) mm diam.	Penstemon floridus var. austinii