Page authors: Don Knoke, David Giblin
Collomia tenella
diffuse collomia, diffuse mountain-trumpet

Distribution: Occurring mostly east of the Cascades crest in Washington; British Columbia to Nevada, east to Idaho, Utah and Wyoming.

Habitat: Dry, open places from the plains to moderate elevations in the mountains.

Flowers: May-July

Origin: Native

Growth Duration: Annual

Conservation Status: Not of concern

Pollination: Flies, moths


Freely-branched, slender annual up to 1.5 dm. tall, with stalked glands at least above.


Leaves alternate, linear, 1-5 cm. long and 1-5 mm. wide.


Flowers numerous, sub-sessile, solitary in the forks of the braches or axils of the leaves; calyx teeth 5, triangular, 1 mm. long; corolla lavender to pink or white, 5-lobed, about twice as long as the calyx; stamens 5, filaments equally inserted, very short; style 3-parted; ovary superior.


Capsule with 3, 1-seeded carpels.

Accepted Name:
Collomia tenella A. Gray
Publication: Proc. Amer. Acad. Arts 8: 259. 1870.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Collomia tenella in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Collomia tenella checklist entry.

OregonFlora: Collomia tenella information.

E-Flora BC: Collomia tenella atlas page.

CalPhotos: Collomia tenella photos.

USDA Plants: Collomia tenella information.

20 photographs:
Group by