km 165.5 on México 40, 2220m, R.K. Vickery Jr. 2901
Type Herbaria
holotype Garrett Herbarium, University of Utah isotype University of Michigan Herbarium isotype U. S. National Herbarium isotype Rancho Santa Ana Botanic Garden isotype Herbario Nacional, Universidad Nacional Autónoma de México isotype Herbarium, Sul Ross State University isotype GH isotype University and Jepson Herbaria isotype DS