procambium

The primary meristem that gives rise to vascular tissue.

In botany, a long-celled initial strand of a vascular bundle; a similar or homogeneous formative cell of a bundle. Compare cambium.

The young tissue of a fibrovascular bundle before its component cells have begun to be differentiated.

A meristem that lies just inside the protoderm and develops into primary xylem and primary phloem.