Wahlert, G. A., Chiarini, F. E., et al. 2014. Syst. Bot. 40 (3): 872.
Rafinesque, C. S. 1840. Autikon Botanikon.
Type Status:
Isoneotype
Place:
Van Zandt County. Hill Ranch, ca. 0.5 mi. N of TX State Highway 64, ca. 7.6 mi. W of Jct. of Highways 64 and 49 (toll road), Van Zandt, Texas, United States, North America