Majure L. C., Achá S., Baker M. A., Puente-Martínez R., Köhler M., Fehlberg S., Phylogenomics of One of the World’s Most Intriguing Groups of CAM Plants, the Opuntioids (Opuntioideae: Cactaceae): Adaptation to Tropical Dry Forests Helped Drive Prominent Morphological Features in the Clade, Diversity, 2023, 15(4):570, doi: 10.3390/d15040570
An analysis of 103 plastid genes in 107 Opuntioideae taxa. The paper reconstructs geographical origins, habitat shifts and the evolution of large leaves and flattened stems. It indicates the independent establishment of long-lived photosynthetic leaves in different opuntioid lineages.