Page authors: Don Knoke, David Giblin
Penstemon serrulatus
Cascade beardtongue, coast penstemon

Distribution: Occurring on both sides of the Cascades crest and in the Olympic Mountains in Washington; southern British Columbia to Oregon.

Habitat: Moist to wet meadows and forest openings, from low elevations to the subalpine.

Flowers: June-August

Origin: Native

Conservation Status: Not of concern


Perennial from a branching, woody base, the several stems 2-7 dm. tall, glabrous or puberulent, not at all glandular.


Leaves opposite, glabrous, all cauline, the lower ones reduced and short-petiolate, the others sessile, lanceolate to ovate-oblong, sharply serrate, 3-8 cm. long and 1-3.5 cm. wide.


Inflorescence often a single, compact, terminal verticillaster, sometimes of several and more open; calyx 5-9 mm. long, the 5 segments with marginal hairs; corolla deep blue to dark purple, 17-25 mm. long, glabrous inside and out; anthers permanently horseshoe-shaped, 1.1-1.6 mm. long; pollen sacs dehiscent only on their confluent apices; fertile filaments glabrous; staminode with a long, yellowish beard on the upper half, the tip flattened.


Capsule 5-8 mm. long.

Accepted Name:
Penstemon serrulatus Menzies ex Sm.
Publication: The Cyclopaedia; or, universial dictionary of arts, . . . 26: Penstemon no. 5. 1813.

Synonyms & Misapplications:
(none provided)
Additional Resources:

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

WA Flora Checklist: Penstemon serrulatus checklist entry.

E-Flora BC: Penstemon serrulatus atlas page.

CalPhotos: Penstemon serrulatus photos.

USDA Plants: Penstemon serrulatus information.

56 photographs:
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