Sandoval-Molina MA, Zavaleta-Mancera HA, León-Solano HJ, Solache-Ramos LT, Jenner B, et al. (2018) First description of extrafloral nectaries in Opuntia robusta (Cactaceae): Anatomy and ultrastructure. PLOS ONE 13(7): e0200422. https://doi.org/10.1371/journal.pone.0200422
theplantlist.org
Opuntia robusta en The Plant List. Consultado el 18 de julio de 2017.
