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Primary xylem: Xylem tissue that differentiates from the procambium during primary growth and maturation of a vascular plant. Divided into earlier protoxylem and later metaxylem. Tissues form the principal axial water conducting system in vascular plants protoxylem forms first (left), then metaxylem (right); (rays are absent from the primary xylem itself, but may be present between vascular bundles)