Phacelia cookei

It is endemic to Siskiyou County, California, where it is known from just a few occurrences in the forest and scrub around Mount Shasta.

The substrate in the area is sandy, ashy volcanic soil.

It is an annual herb growing in a small, flat mat or with a short upright stem a few centimeters high.

The oval, smooth-edged leaves are one or two centimeters long and borne on short petioles.

The hairy inflorescence is a one-sided curving or coiling cyme of several tiny bell-shaped flowers.