Vascular tissue that transports water and minerals from the roots throughout the cannabis plant stems and leaves.
Merriam-Webster Online Dictionary
xylem (noun)a complex tissue in the vascular system of higher plants that consists of vessels, tracheids, or both usually together with wood fibers and parenchyma cells, functions chiefly in conduction of water and dissolved minerals but also in support and food storage, and typically constitutes the woody element (as of a plant stem) - compare phloem
vascular tissue, plant transport system, water-conducting tissue, sapwood, tracheary elements