Page authors: Don Knoke, David Giblin
Collomia grandiflora
large-flowered collomia, large-flower mountain-trumpet

Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana, Wyoming, and Colorado.

Habitat: Dry, open to lightly wooded areas, lowlands to middle elevations in the mountains.

Flowers: May-August

Origin: Native

Growth Duration: Annual

Conservation Status: Not of concern


Robust, tap-rooted annual up to 1 m. tall, from simple and unbranched to often with many axillary branches terminating in flower clusters.


Leaves numerous, lanceolate, alternate, sessile and entire, 2-8 cm. long and 3-15 mm. wide.


Flowers in tight clusters, terminating the stem and branches; calyx tube of uniform, papery texture, the 5 lobes up to 4 mm. long; triangular, pointed, herbaceous; corolla tubular, salmon-colored, 2-3 cm. long, the 5 lobes 5-10 mm. long; filaments of unequal length, inserted below the sinuses of the corolla; style 3-parted; ovary superior.


Capsule with 3, 1-seeded carpels.

Accepted Name:
Collomia grandiflora Douglas ex Lindl.
Publication: Bot. Reg. 13: pl. 1107. 1827.

Synonyms & Misapplications:
(none provided)
Additional Resources:

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

WA Flora Checklist: Collomia grandiflora checklist entry.

OregonFlora: Collomia grandiflora information.

E-Flora BC: Collomia grandiflora atlas page.

CalPhotos: Collomia grandiflora photos.

USDA Plants: Collomia grandiflora information.

94 photographs:
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