United States, Texas, Presidio, 34 km. NE of Marfa on US Hwy 90.
Grasslands associated with Bouteloua, Aristida, Scleropogon and Muhlenbergia. Herbaceous annual, erect, branching, 50-70 cm. tall. Clayey, sandy soil. With 6 yellow ray flowers. Frequent along edge of highway.