Recent phylogenetic analysis that tiny-flowered P. cookei is sister to P. suaveolens ssp. keckii, another extremely rare phacelia, which is restricted to the Cleveland National Forests in Orange and Riverside Counties, southern California. This photo shows Cooke’s phacelia in full flower! Photo by Kim Earll.
Cooke’s phacelia grows only in a small area of far northern California: at the northern base of Mt. Shasta, a volcano in the southern Cascade Range; it is limited to areas of high disturbance on ashy, volcanic sand, in and along unpaved roads where there is low surface organic matter and little competition from other plants. Photo by Kim Earll.
Phacelia cookei range map.