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.
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.
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.