T. R. Van Devender, D. Larson, P. Merlin, M. J. Martinez C.
Agua Amarilla (Los Pinitos), 15 km west-northwest of Tepoca (KM 200 east of Hermosillo) on Mex 16.
28.466944 -109.339722
900 meters (2952ft)
Red hydrothermically-altered volcanic barren with isolated Pinus tecorensis-Quercus albocinata woodland
Locally common herbaceous perennial from underground bulb, mostly in rock crevices on north-facing or shady slopes, above small intermittent stream colored with minerals from bedrock; flowers white.