Bárcenas R. T., A phylogenetic classification of Grusonia, Opuntioideae, Cactaceae, Haseltonia, 2023, 30(1):2-5, doi: 10.2985/026.030.0101
A proposed Grusonia classification based on a phylogeny of five plastid markers. It distinguishes two subgenera and four sections, linking the naming of these units to the phylogenetic lineages identified.