The mountain tail-leaf (Pericome caudata) belongs to Asteraceae (the Astar family). It is a perennial herb that is native to the southwestern United States as far east as Colorado, Oklahoma, and Texas, as well as northern Mexico. This herb grows in rocky habitat, often in hills and mountains, and sometimes in disturbed areas, and up to a height of 90-180 cm. It is much-branced, glandular, sparsely hairy, and aromatic. The leaves are somewhat triangular, sometimes with a few large teeth or sharp lobes, the blade measuring up to 12 cm long. The yellow flower-heads bloom from August to October. They are rayless, and filled with golden yellow disc florets.