What is "psilactis"

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

1. Psilactis asteroides A.Gray - AZ NM TX, Chihuahua, Coahuila, Nuevo León, Durango, Jalisco, Aguascalientes, Sonora, Sinaloa, Querétaro, México State, Michoacán
2. Psilactis brevilingulata Sch.Bip. ex Hemsl. - AZ NM TX, Mexico, Colombia, Peru
3. Psilactis gentryi (Standl.) D.R.Morgan - Huachuca Mountains in Arizona, Sonora, Chihuahua, Durango, Hidalgo, México State
4. Psilactis heterocarpa (R.L.Hartm. & M.A.Lane) D.R.Morgan - TX
5. Psilactis odysseus (G.L.Nesom) D.R.Morgan - Nuevo León, Tamaulipas

• Psilactis coulteri A.Gray - Machaeranthera coulteri (A.Gray) B.L.Turner & D.B.Horne
• Psilactis crispa Brandegee - Machaeranthera crispa (Brandegee) B.L.Turner & D.B.Horne
• Psilactis leptos Shinners - Psilactis asteroides A.Gray
• Psilactis tenuis S.Watson - Machaeranthera tenuis (S.Watson) B.L.Turner & D.B.Horne