Mexico, Sonora, Guaymas Municipio, South end of Sierra Libre; 12.3 miles south of La Palma on Mex. Hwy. 15 (at KM 190), then 4.9 mi east of highway to 0.1 mile below summit of Microondas Avispas mountain.
28.48333 -111
715 metros (2345pies)
Steep rocky north facing slope. Rhyolitic rock.
In Frank W. Reichenbacher collection, number 1784.