Phacelia dalesiana is a species of flowering plants in the borage family endemic to California.

[4] Phacelia dalesiana is a perennial herb producing a few decumbent stems up to about 15 centimeters long, forming a patch on the ground.

The inflorescence is a small curving cluster of flowers each just under a centimeter wide.

The type location is the summit of Scott Mountain in Trinity County, California, near California State Route 3 and the Pacific Crest Trail, the type locality for many species of rare endemic plants.

The plant is a paleoendemic, its morphology unique among the phacelias, and probably a relict persisting in areas of ultramafic rock substrate in a small section of the Siskiyou-Trinity Mountains.