A caudex (plural: caudices) is a form of stem morphology appearing as a persistent, spheroid enlargement (frequently woody, and non-photosynthetic) of the root crown or stem axis of an otherwise herbaceous stem. Caudices may extend below ground. This structure commonly appears in (but isn't limited to) plants adapted to xeric environments, and functions as a water storage organ. Some trees, such as Eucalyptus camaldulensis, also have a caudex, as an adaptation to ecosystems where periodic (natur… (More on Caudex)