 Phyllodes are common in the genus "Acacia", especially the Australian species, at one time put in "Acacia" subgenus "Phyllodineae".In "Acacia koa", the phyllodes are leathery and thick, allowing the tree to survive stressful environments.The petiole allows partially submerged hydrophytes to have leaves floating at different depths, the petiole being between the node and the stem.