A cardinal organ part (PO:0025001) that is part of a plant axis (PO:0025004) and has as parts a cambium (PO:0005597) and adjacent cells. [source: POC:curators]
Comment
The cambial zone generally consists of the initial cells of the cambium and their immediate derivatives, arranged in radial files. This term is used for the cambium (PO:0005597) and surrounding area, especially when the borders of the cambium are not clear.