Majure, L.C., Judd, W.S., Soltis, P.S. and Soltis, D.E. 2017.

Taxonomic revision of the Opuntia humifusa complex (Opuntieae: Cactaceae) of the eastern United States

. Phytotaxa. 290, 1 (Jan. 2017), 1–65. DOI:https://doi.org/10.11646/phytotaxa.290.1.1.