تنه خرمایی

thumb|The caudex of a tree fern resembles the trunk of a woody plant, but has a different structure. thumb|The caudex of Jatropha cathartica is [[pachycaul, with thickening that provides water storage.]] thumb|Certain cacti can develop a caudex too; here Acanthocereus maculatus A caudex (: caudices) of a plant is a stem, but the term is also used to mean a rootstock and particularly a basal stem structure from which new growth arises.