Madia doris-nilesiae T.W.Nelson & J.P.Nelson Harmonia doris-nilesiae is a species of flowering plant in the family Asteraceae known by the common names serpentine tarweed and Niles' madia.

This plant was first described in science in 1985, when it was named Madia doris-nilesiae after the California botanist and teacher Doris Niles.

Harmonia doris-nilesiae is an annual herb growing up to about 26 centimetres tall; its upper branches are bristly and glandular.

The inflorescence bears several flower heads on long, thin peduncles.

Harmonia doris-nilesiae is endemic to the southern Klamath Mountains of far northern California, where it grows in serpentine soils.