vascular bundle

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In botany, strand of primary conducting tissue (a ‘vein’) in vascular plants, consisting mainly of water-conducting tissues, metaxylem and protoxylem, which together make up the primary xylem, and nutrient-conducting tissue, phloem. It extends from the roots to the stems and leaves. Typically the phloem is situated nearest to the epidermis and the xylem towards the centre of the bundle. In plants exhibiting secondary growth, the xylem and phloem are separated by a thin layer of vascular cambium, which gives rise to new conducting tissues.

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