Penstemon digitalis

Herbs. Stems erect, 25–90 cm, glabrous or sparsely retrorsely hairy, slightly glaucous or not. Leaves basal and cauline, basal sometimes withering by anthesis, not leathery, glabrous; basal and proximal cauline 30–180(–250) × 4–38(–70) mm, blade spatulate to obovate or lanceolate, base tapered, margins entire or ± serrate or denticulate, apex rounded to obtuse or acute; cauline 5–8 pairs, petiolate or sessile, 26–195 × 4–55 mm, blade ovate to lanceolate, base tapered to clasping, margins entire or denticulate, apex acuminate to acute. Thyrses interrupted, conic, 7–26(–34) cm, axis glabrous proximally, sparsely to densely glandular-pubescent distally, verticillasters (2 or)3–6, cymes (3–)5–12(–18)-flowered, 2 per node; proximal bracts lanceolate to linear, 9–105 × 1–40 mm, margins entire, sometimes serrulate; peduncles and pedicels spreading to ascending, sparsely glandular-pubescent. Flowers: calyx lobes ovate, sometimes lanceolate, 4–8 × 2–3 mm, apex acute to acuminate, glandular-pubescent; corolla white, sometimes tinged lavender, with reddish purple nectar guides, ventricose, (17–)20–30 mm, glandular-pubescent externally, sparsely to moderately white-pubescent internally abaxially, tube 6–9 mm, throat abruptly inflated, 8–12 mm diam., slightly 2-ridged abaxially; stamens included or longer pair reaching orifice, pollen sacs opposite, navicular, 1.4–1.7 mm, dehiscing completely, connective splitting, sides sparsely pubescent, hairs white or purplish, to 0.6 mm, rarely glabrous, sutures papillate; staminode 13–17 mm, reaching orifice, 0.3–0.4 mm diam., tip straight to slightly recurved, distal 6–8 mm sparsely to moderately villous, hairs yellowish, to 1.5(–2) mm; style 13–18 mm. Capsules 8–14 × 4–6 mm, glabrous. 2n = 96.

Water sparingly, allowing the mix to nearly dry out between watering.

Penstemon Digitalis

Penstemon digitalis

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Ornamental

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