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
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Bumblebees, bees, flies, wasps, hummingbirds
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.
PNW Herbaria: Specimen records of Penstemon serrulatus in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Penstemon serrulatus checklist entry
OregonFlora: Penstemon serrulatus information
E-Flora BC: Penstemon serrulatus atlas page
CalPhotos: Penstemon serrulatus photos