Eurybia horrida is a species of flowering plant in the family Asteraceae known by the common names spiny aster and horrid herrickia.

It is native to Colorado and New Mexico in the United States, where it occurs only in the Canadian River basin.

Eurybia horrida is a clumpy perennial herb or subshrub growing 30 to 60 centimeters tall from a woody rhizome.

They are tough, glandular, coated in rough hairs, and lined with spiny teeth on the edges.

[10][1] Eurybia horrida has a very limited range in the upper basin of the Canadian River mainly in New Mexico, but also into parts of southern Colorado.