Psilactis is a genus of North American and South American plants in the tribe Astereae within the family Asteraceae which are known by the common name tansyaster.

[8] Five species within the genus have native distribution in Mexico.

Psilactis heterocarpa is restricted to Texas in the United States with no Mexican distribution.

[9] P. odysseus is restricted to the Mexican states Nuevo León and Tamaulipas,[10] and the other four species, P. asteroides,[11] P. brevilingulata,[12] P. gentryi,[13] and P. tenuis[14] have distributions in both Mexico and the United States.

P. brevilingulata has an additional presence in Colombia and Peru.