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Large Flowered Collomia, Grand Collomia, Mountain Collomia - Collomia grandiflora


Family: Polemoniaceae - Phlox family Genus Common Name: Trumpet Flower Native Status: Native
Collomia grandiflora - Large Flowered Collomia, Grand Collomia, Mountain Collomia. There are 13 species of Collomia in the United States, with all but 1 of them (Collomia linearis) being found exclusively in the western half of the United States. C. linearis is found in the west as well as the rest of the northern United States and most of Canada. The species presented here, C. grandiflora, found in 10 western states as well as in British Columbia (C. heterophylla and C. linearis are also found in British Columbia.)

Found in:
AZ, CA, CO, ID, MT, NV, OR, UT, WA, WY

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Collomia grandiflora

Distribution of Collomia grandiflora in the United States and Canada:
USDA Plants Distribution Map temporarily unavailable.
Blue=Native; Grey=Introduced

Map from USDA Plants Database:
USDA, NRCS. 2009. The PLANTS Database (http://plants.usda.gov, 30 Mar 2017). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.

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Site: Kleinschmidt Grade, Adams County, ID Date: 2012-May-28Photographer: Gerald C. Williamson
Nikon D7000
The flowers of Collomia grandiflora are yellow or salmon, fading to white. While all of the plants I photographed had white pollen, blue is reported as being more characteristic, at least in California.
Collomia grandiflora

Site: Kleinschmidt Grade, Adams County, ID Date: 2012-May-25Photographer: Gerald C Williamson
Nikon D7000
The five corolla lobes fuse to form a trumpet-shaped corolla, giving the genus the “Trumpet Flower” common name. In the lower flower in this photo you can see three exserted stamens, as well as two included stamens. Along with size and to a lesser extent color, stamen position is among the differences with the somewhat similar Collomia linearis - Narrowleaf Mountain Trumpet. C. grandiflora will normally have at least 1 exserted stamen; all those of C. linearis are included. The style extends beyond the corolla. It is split into three stigmas, characteristic of the Phlox family.
Click on the photo for a larger image
Collomia grandiflora

Site: Kleinschmidt Grade, Adams County, ID Date: 2012-May-28Photographer: Gerald C Williamson
Nikon D7000
The stem and involucre bracts are quite hairy, with the involucre bracts and upper leaves usually glandular-hairy. The lower leaves may be glabrous or only slightly hairy.
Click on the photo for a larger image
Collomia grandiflora

Site: Kleinschmidt Grade, Adams County, ID Date: 2012-May-28Photographer: Gerald C Williamson
Nikon D7000
The alternate, lanceolate to linear leaves rise on a hairy stem to the terminal cluster of salmon to white flowers. The plant is usually unbranched, although there may occasionally be axillary stems. The plants I observed were all 12” to 15” tall.
Click on the photo for a larger image
Collomia grandiflora

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All content except USDA Plants Database map Copyright Gerald C. Williamson 2017
Photographs Copyright owned by the named photographer