Senecio ertterae is a species of flowering plant in the aster family known by the common name Ertter's ragwort.

The yellow ray florets are each about half a centimeter long.

[2] This species occurs in the Leslie Gulch in eastern Oregon, in Malheur County.

Other plants in the sparsely vegetated habitat include Pseudoroegneria spicata (bluebunch wheatgrass), Bromus tectorum (cheatgrass), Mimulus cusickii (Cusick's monkeyflower), Eriogonum vimineum (broom buckwheat), and Phacelia hastata (silverleaf phacelia).

[4] An annual species, this plant may be much more prevalent in years with sufficient rainfall.