Edwards E. J., Correlated evolution of stem and leaf hydraulic traits in Pereskia (Cactaceae), New Phytologist, 2006, 172(3):479-489, doi: 10.1111/j.1469-8137.2006.01850.x
The study compares leaf and stem hydraulic conductance of seven leafy cacti. It analyses covariation of water transport and stomatal behaviour.