Phacelia adenophora is a species of phacelia known by the common name hairy yellow phacelia. It is native to the northwestern United States where it can be found in Oregon, northeastern California, and northwestern Nevada. It grows in mountain and plateau habitat. This is an annual herb producing decumbent, creeping, spreading, or upright branched stems up to 40 centimeters long. The leaves are oblong in shape and deeply lobed, measuring up to 3 centimeters long. The flower cluster is a one-sided cyme of many bell-shaped flowers each under a centimeter long. Unlike many phacelias, which bloom in shades of blue and purple, this species has yellow to golden flowers. The fruit is a fuzzy, oblong capsule a few millimeters in length containing up to 14 seeds.