Page authors: Don Knoke, David Giblin
Penstemon attenuatus
sulphur penstemon, taper-leaved penstemon
WTU specimens
Other herbaria

Distribution: Occurring east of the Cascades crest in Washington; Washington south to Oregon, east to western Montana and southern Idaho.

Habitat: Drier meadows and moist, open to wooded slopes in the mountains and foothills.

Flowers: June-August

Origin: Native

Conservation Status: Not of concern

Description:
General:

Tufted, perennial herbs from a crown, the stem 1-9 dm. tall, glabrous or finely pubescent below the inflorescence.

Leaves:

Leaves opposite, deep green, entire, the basal ones well developed, petiolate, up to 17 cm. long and 4 cm. wide, the cauline mostly sessile, reduced upward.

Flowers:

Inflorescence of 2-several dense verticillasters; calyx 4-7 mm. long, the 5 segments lanceolate to ovate or obovate, the margins scarious; corolla 2-lipped, glandular-hairy externally, blue or purple to pale yellow or nearly white, 12-20 mm. long, the tube expanded toward the mouth; staminode and raised portion of lower petal bearded; pollen sacs glabrous, becoming opposite.

Fruits:

Capsules 6-8 mm. long.

Accepted Name:
Penstemon attenuatus Douglas ex Lindl.

Synonyms & Misapplications:
(none provided)
Infraspecies:
var. attenuatus – sulphur penstemon, taper-leaved penstemon
var. palustris – sulphur penstemon, taper-leaved penstemon
Additional Resources:

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

WA Flora Checklist: Penstemon attenuatus checklist entry.

E-Flora BC: Penstemon attenuatus atlas page.

CalPhotos: Penstemon attenuatus photos.

USDA Plants: Penstemon attenuatus information.

15 photographs:
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