As plants grow, stems and branches thicken or increase in girth. This thickening is a result of cells in the vascular cambium. Vascular cambium can develop into either xylem or phloem tissue within a plant. Because of this unique ability, we would expect vascular cambium cells to have all but one of these characteristics.
woody, re-inforced cell walls. We would not expect vascular cambium to have woody, re-inforced cell walls. We would expect vascular cambium to be simple, undifferentiated cells that are capable of rapid cell division.