Mexico, Sonora, Campo Bonita in Arroyo el Chinosos (=El Tigre), 39.9 km (by air) WNW of Bavispe, 45.9 km (by air) ENE of Nacozari de Garcia, Sierra el Tigre.
30.576944 -109.268611
30d 34m 37s N; 109d 16m 7s W
1246 meters (4087ft)
Riparian forest with desert grassland on south-facing slope, oak woodland on north-facing slope.
Uncommon annual in disturbed soil near corral; flowers yellow.