Parthenium alpinum

Parthenium alpinum is a species of flowering plant in the aster family known by the common names alpine feverfew and Wyoming feverfew. It is native to Wyoming, Colorado, and New Mexico in the United States.

This is a small, mat-forming, long-lived perennial herb with gray-green, hairy leaves and solitary flower heads. The heads contain whitish or greenish disc florets and a few pistillate ray florets that do not have ligules. Flowering occurs in mid-April through mid-May.