Mexico, Sonora, Arroyo Cajon del Diablo, northwestern Sierra San Luis, 3.7 km S of MEX 2 (at 80 km E of Agua Prieta), ca. 67.7 km (by air) E of Agua Prieta, Cuenca Los Ojos Conservation Area.
31.288611 -108.796944
31° 17' 19" N 108° 47' 49" W
1772 meters (5812ft)
Cupressus-Acer-Quercus canyon forest.
Locally common herbaceous perennial, rays white, disk yellow.