A caudex (: caudices) of a plant is a Plant stem, but the term is also used to mean a rootstock and particularly a basal stem structure from which new growth arises.[pages 456 and 695]
In the strict sense of the term, meaning a stem, "caudex" is most often used with plants that have a different stem morphology from the typical flowering plant dicotyledon stem;[ examples of this include Arecaceae, , and . The largest of all caudices is that of the ombu ( Phytolacca dioica) of the Pampas of South America, which can be thick.][William Henry Hudson, "Far Away and Long Ago" (1918) New York: E.P. Dutton page 5]
The related term caudiciform, literally meaning stem-like, is sometimes used to mean pachycaul, thick-stemmed.[ Caudices should not be confused with lignotubers which can also be very large.
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Etymology
The term is from the Latin language caudex, a noun meaning "tree trunk".
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