Page author: David Giblin
Penstemon triphyllus
whorled beardtongue
WTU specimens
Other herbaria

Distribution: Occurring chiefly in the southeastern area of Washington; Southeast Washington south to adjacent Oregon and east to adjacent Idaho.

Habitat: Cliff crevices and dry, rocky banks and slopes at low elevations.

Flowers: May-July

Origin: Native

Conservation Status: Not of concern

Description:
General:

Taprooted perennial, shrubby at the base, the numerous, slender and brittle stems 2.5-8 dm. tall, puberulent.

Leaves:

Leaves irregularly arranged, many ternate or whorled, others opposite or single, glabrous or puberulent, all cauline, the lowermost reduced, the others numerous, sessile from a narrow base, linear or narrowly lance-elliptic, up to 5 cm. long and 1 cm. wide, irregularly and sharply toothed.

Flowers:

Inflorescence a loose panicle, often leafy-bracteate below; calyx 4-6 mm. long, the 5 segments green or purplish, entire, often unequal; corolla blue-lavender to light purple-violet, 13-19 mm. long, weakly bilabiate, glandular-hairy outside and glabrous within, the upper lip cleft more than half its length; anthers 0.9-1.3 mm. long, permanently horseshoe-shaped, the pollen sacs saccate and indehiscent below; staminode exerted, long-bearded half its length.

Fruits:

Capsule 4-6 mm. long

Accepted Name:
Penstemon triphyllus Douglas ex Lindl.
Publication: Edwards's Botanical Register 15: pl. 1245. 1829.

Synonyms & Misapplications:
(none provided)
Infraspecies:
var. triphyllus – whorled beardtongue
Additional Resources:

PNW Herbaria: Specimen records of Penstemon triphyllus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Penstemon triphyllus checklist entry.

E-Flora BC: Penstemon triphyllus atlas page.

CalPhotos: Penstemon triphyllus photos.

USDA Plants: Penstemon triphyllus information.

12 photographs:
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