]> GH barcode-01869098 United States of America Texas canyons of the southern end of the county; upper end of Mexican Canyon (Arroyo Segundo) 75-80 mi. S. Marfa Toxicodendron radicans subsp. eximium (Greene) Gillis (Greene) Gillis 2019-02-25 17:21:30 L. C. Hinckley