Ávila-Argáez M., Yáñez-Espinosa L., Badano E., Barragán-Torres F., Flores J., Extrafloral nectaries of Cylindropuntia imbricata (Cactaceae) in the southern Chihuahuan Desert: anatomy and interaction with ants, Arthropod-Plant Interactions, 2019, 13(3):401-409, doi: 10.1007/s11829-018-9656-3
The anatomy of extrafloral nectaries in Cylindropuntia imbricata and a field watering experiment. The paper describes gland tissues, their position in areoles and an increase in the number of visiting ants with greater soil water availability.