]> GH barcode-00056967 Mexico Nuevo León Mun. Rayones, Sierra Madre Oriental, gypsum slope just east of road leading from Rayones to Galeana, 13.6 miles from middle of bridge across Rio Pilon, 1500 m., 24° 55' 45" N, 100° 03' 45" W Erigeron pattersonii G. L. Nesom G. L. Nesom 2010-08-16 16:37:14 T. F. Patterson, K. Clary & J. Clary