Page author: David Giblin
Castilleja thompsonii
Thompson's paintbrush
WTU specimens
Other herbaria

Distribution: East of the Cascade summits in Washington; British Columbia south to Oregon.

Habitat: Dry sagebrush deserts to high mountain ridges.

Flowers: May-September

Origin: Native

Conservation Status: Not of concern

Description:
General:

Perennial herb; stems clustered, erect to ascending, 1-4 dm tall, hairy, often tinged with maroon.

Leaves:

Lower leaves simple, linear; upper leaves narrow with 3-5 linear lobes; lightly hairy. Inflorescence leaves (bracts) yellowish-tinged.

Flowers:

Calyx 12-25 mm long, maroonish in color, with 4 acute lobes at tip, cleft more deeply above and below than on sides. Corolla incospicuous, greenish, hidden within the more showy calyx, the galea (upper beak) short, the lower lip greater than 1/2 length of galea, scarcely pouched. Ovary superior, 2-celled.

Fruits:

Many-seeded capsules.

Identification Notes:

Can be sufficiently separated from other Castilleja species in Washington by the combination of perennial habit, yellowish inflorescences, acute calyx tips with median clefts deeper than the lateral clefts, greenish corolla enclosed by the calyx (or nearly so), and close association with sagebrush. See also Castilleja cervina.

Comments:

Plants found at higher elevations tend to be smaller, less pubescent and more glandular.

Accepted Name:
Castilleja thompsonii Pennell
Publication: Proceedings of the American Academy of Arts and Sciences 99(7): 178-179. 1947.

Synonyms & Misapplications:
Castilleja villicaulis Pennell & Ownbey
Additional Resources:

PNW Herbaria: Specimen records of Castilleja thompsonii in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Castilleja thompsonii checklist entry.

E-Flora BC: Castilleja thompsonii atlas page.

CalPhotos: Castilleja thompsonii photos.

USDA Plants: Castilleja thompsonii information.

69 photographs:
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