Species Identification

Interested in the identification of penstemons? Please select a species then click on submit:

AttributeThe current selection is Penstemon_franklinii
ClassificationPenstemon Penstemon Cristati
GeneralFranklin’s Penstemon. Blooms: late May and June.
Anther1.5-1.8 mm long, opening the full length, remaining nearly parallel (v-shaped) after dehiscence (opening), smooth, and dark blue on back with white edges.
StaminodeIncluded, densely yellow-bearded half its length, slightly recurved at the tip.
Leaves3/3-5.4 cm (1 ¼-2 ¼”) long, including the narrowly winged stem, glabrous (smooth) near the base of the stems, the lowermost leaves spatulate to narrowly oblanceolate, tapering into an elongate stem, leaf often involute, rolled or folded, arched, the mid and upper cauline leaves stemless, 2.8-4.3 cm (1-1 ¾’) long & 4.7-6.5 mm (1/4-1/2”) wide, lanceolate, the margins toothed, especially at the broad base that remains flat and the elongate tip narrower and folded or rolled and arched.
StemsPerennial herb, 1-2 dm (4-8”) tall, from an underground, branched caudex (or thick crown) in young plants, surmounting a thick, short taproot; herbage with stems retrorsely cinerous-puberulent (minute ashy hairs pointing backward).
InflorescenseThyrse consisting of 3-6 verticillasters, the cymes 2-4 flowered and short-stemmed (cyme stem) and pedicelled (flower stem), glandular-pubescent (sticky, hairy), with spreading hairs, the bracts at the lowest node leaf-like, but entire or only weakly toothed, often smooth, becoming narrower and short and glandular-pubescent upwards.
Corolla11-15 mm (>1/2”) long, blue-violet, tubular-funnelform, the tube 4-5 mm long, the blue or pale blue lobes sub-equal, spreading forward, glandular-puberulent externally, the throat white to pale blue with brown-violet lines.
Flower Color
Calyx5.3-7 mm (to ¼”) long, the segments lanceolate, entire, acute, and glandular-pubescent and the margins herbaceous (soft, green).
HabitatFound in semi-barren areas in sagebrush country, often growing in sandy-loamy soil with Eriogonum shockleyi, 1640-1720 m (5400-5700’) elev.
RangeEndemic (restricted to) the n end of Cedar Valley, Iron Co., UT.