Chamaechaenactis, common name fullstem,[3] is a genus of flowering plants in the daisy family.

[4][5][6] There is only one known species, Chamaechaenactis scaposa, native to the western United States (Colorado, New Mexico, Texas, Wyoming, Arizona, Utah)[3][1][7] It is a perennial up to 10 cm (4 inches) tall with a thick underground caudex.

Most of the leaves are in a basal rosette.

Flower heads are usually produced one at a time, with white to pink disc florets but no ray florets.

This Asteroideae article is a stub.