Flora of North America species comparison

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Penstemon sect. Petiolati
Habit Shrubs or subshrubs.
Stems

glabrous or scabrous to puberulent, glaucous.
Leaves

cauline, opposite, ± leathery or not, glabrate or scabrous, glaucous;

cauline petiolate or sessile, blade ovate, margins toothed.
Thyrses

continuous, cylindric, axis puberulent, cymes 2 per node;

peduncles and pedicels spreading to ascending.
Flowers

calyx lobes: margins entire, narrowly scarious, glandular-pubescent, rarely glabrous;

corolla magenta to pink, bilaterally symmetric, weakly bilabiate, not personate, weakly ventricose, glandular-pubescent externally, hairy internally abaxially, glandular-pubescent adaxially, throat moderately inflated, not constricted at orifice, rounded abaxially;

stamens included or longer pair slightly exserted, filaments glabrous, pollen sacs opposite, subexplanate to explanate, dehiscing completely, connective splitting, sides glabrous, sutures smooth;

staminode slightly exserted, flattened distally, 0.4–0.5 mm diam., tip straight, glabrous;

style glabrous.
Capsules

glabrous.
Seeds

dark brown to black, angled, 0.9–1.2 mm.

Penstemon sect. Petiolati
Distribution
w United States
Discussion

Species 1.

Penstemon petiolatus is the only member of sect. Petiolati. D. D. Keck (1937) noted morphologic similarities between P. petiolatus and P. clevelandii of sect. Spectabiles. Penstemon petiolatus has not been examined molecularly.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 17, p. 228.
Parent taxa Plantaginaceae > Penstemon > subg. Penstemon
Subordinate taxa
Synonyms P.
Name authority (Rydberg) Pennell: Contr. U.S. Natl. Herb. 20: 326, 328. (1920)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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