What is "psathyrotopsis"

Psathyrotopsis is a genus of North American plants in the Spanish needles tribe within the sunflower family.

1. Psathyrotopsis hintoniorum B.L.Turner - Coahuila
2. Psathyrotopsis purpusii (Brandegee) Rydb. - Coahuila
3. Psathyrotopsis scaposa (A.Gray) H.Rob. - Chihuahua, Texas, New Mexico