Collomia grandiflora

From Puget Prairie Plants
  • Scientific Name: Collomia grandiflora
  • Family: Polemoniaceae
  • Common Names: large-flowered collomia, large-flower mountain-trumpet
  • Codon: COLGRA

Photo by Ben Legler, 2004. Also featured on Main Page


Scientific classification
Kingdom: Plantae
Subkingdom: Viridiplantae
Phylum: Tracheophyta
Subphylum: Spermatophytina
Class: Magnoliopsida
Subclass: Asteranae
Order: Ericales
Family: Polemoniaceae
Genus: Collomia Nutt.
Species: Collomia grandiflora Douglas ex. Lindl



Annual herb growing from taproot with terminal clusters of salmon to white-colored flowers, up to 1 m tall.[2] Stems simple or with axillary branching,[2] white haired.[3] Leaves alternate, entire, lanceolate, to 8 cm long.[2] Inflorescences capitate.[4] Flowers radially symmetrical, 5-merous; calyx 5-lobed, tubular; corolla tubular-funnelform, 5 lobed; stamens 5, epipetalous;[3] pistil 3-carpellate with trifid stigma, superior ovary becoming a loculicidal capsule.[5]

Bloom Period



Widely distributed across Washington; British Columbia to California, east to Rocky Mountains.[2]


Open, moist to rather dry areas, low to moderate elevations.[2]


Infusion of roots or of leaves and stalks taken by Okanogan-Colville as a laxative; Infusion of roots taken by Okanogan-Colville for high fevers; Use of leaves by Paiute and others as a protective covering for filled berry containers.[6]


Native Plant Network Propagation Protocol

Collomia grandiflora seeds
Photo Credit Lisa HIntz


Abbreviation: COGRX

Seed sample from: 2011

Average measurement: 3 x 1.5 x 1.1

Measurement range: L: 2.75 - 3.1 W: 1.2 x 1.7 D: 0.9 x 1.3


Shape: One end of seed is slightly more rounded than other. This is the hilium end. One side of seed has longitudinal sulcus that does not reach the hilium or opposite apex.

Color: Hilium indistinct. Entire seed surface mostly uniform in color. Seed is brown with some white spots that are flakey looking.

Surface:Entire seed is very bumpy, sometimes slightly ridged. When wet, seed coat forms many clear, mucilaginous threads.

Could be confused with: Gilia capitata

Latitudinal cross section: elliptical COGRX lat.png

Longitudinal cross section: elliptical COGRX long.png

Basic Explanations and Assumptions:

The dimensions for the seeds are length x width x depth. The location of the hilum is used as the base of the seed, and the length is measured from hilum to the opposite apex. Where a style is present, the length is measured from the hilum to the bottom of the style. Width is measured at a right angle to the length at the widest part. Depth is measured at a right angle to the intersection of height and width lines.

Measurements included are the mean average for each measurement of ten separate seeds.

All measurements in millimeters unless otherwise noted.

Photo Gallery


  1. Integrated Taxonomic Information System. Retrieved from
  2. 2.0 2.1 2.2 2.3 2.4 2.5 WTU Herbarium, Burke Museum, & University of Washington. Retrieved from
  3. 3.0 3.1 Hitchcock, C. L., Cronquist, A., Giblin, D., & Legler, B. et al. (2018). Flora of the Pacific Northwest: an illustrated manual. Seattle: University of Washington Press. p. 384.
  4. Jepson Herbarium Online Flora. Retrieved from
  5. Hitchcock, C. L., Cronquist, A., Giblin, D., & Legler, B. et al. (2018). Flora of the Pacific Northwest: an illustrated manual. Seattle: University of Washington Press. p. 382.
  6. Native American Ethnobotany Database. Retrieved from