What is "phanerostylis"

Phanerostylis is a genus of Mexican plants in the boneset tribe within the sunflower family.

1. Phanerostylis coahuilensis (A.Gray) R.M.King & H.Rob. - Chihuahua, Coahuila, Tamaulipas, Nuevo León, San Luis Potosí, Zacatecas
2. Phanerostylis glutinosa (Brandegee) R.M.King & H.Rob. - Oaxaca, Puebla
3. Phanerostylis hintoniorum (B.L.Turner) R.M.King & H.Rob. - Coahuila, Nuevo León
4. Phanerostylis nesomii (B.L.Turner) R.M.King & H.Rob. - Coahuila, Nuevo León, Tamaulipas
5. Phanerostylis pedunculosa (DC.) R.M.King & H.Rob. - Guanajuato, Aguascalientes, Durango, Hidalgo, Jalisco, Michoacán, San Luis Potosí, Zacatecas