Eriodictyon trichocalyx is a species of flowering plant in the borage family known by the common name hairy yerba santa.

Eriodictyon trichocalyx is a shrub growing erect up to about 2 meters tall, with lance-shaped to oval leaves up to 14 centimeters long.

At higher elevations, the plant tends to a much smaller stature and often appear more thin and ratty; rare, large plants at these elevations tend to be old and woody, and may have a large, tree-like trunk at their base and a great deal of dead wood and twigs.

The Cahuilla people of California used it to treat coughs, colds, sore throats, asthma, tuberculosis, and catarrh.

The Cahuilla also used it as a tea bath, where it relieved rheumatism, tired limbs, fevers, and sores.