Majure L. C., Baker M. A., Cloud-Hughes M., Salywon A., Neubig K. M., Phylogenomics in Cactaceae: A case study using the chollas sensu lato (Cylindropuntieae, Opuntioideae) reveals a common pattern out of the Chihuahuan and Sonoran deserts, American Journal of Botany, 2019, 106(10):1327-1345, doi: 10.1002/ajb2.1364
The plastid genome analysis reconstructs relationships among chollas and other Cylindropuntieae. It includes biogeography, estimates of lineage ages and the evolution of morphological traits. The repeated emergence of similar traits explains some discrepancies between traditional divisions and the molecular tree.