Distribution: Occurring east of the Cascades crest in Kittitas and Yakima counties in Washington; central Washington and also in north-central Oregon.
Habitat: Sagebrush desert.
Flowers: May-June
Origin: Native
Growth Duration: Annual
Conservation Status: Threatened in Washington (WANHP)
Pollination: Flies, moths
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PNW Herbaria: Specimen records of Collomia macrocalyx in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Collomia macrocalyx checklist entry
OregonFlora: Collomia macrocalyx information
E-Flora BC: Collomia macrocalyx atlas page
CalPhotos: Collomia macrocalyx photos