: having the xylem surrounding the phloem —used of certain concentric vascular bundles — compare amphicribral.

What do you mean by Amphivasal vascular bundle?

When xylem surrounds the phloem tissue from all sides the vascular bundle is called as 'amphivasal vascular bundle' or 'leptocentric type'. Such bundles are seen in monocot plant, like Dracaena after secondary growth. Bicollateral vascular bundles are present in Helianthus and Cucurbita.

What is Amphivasal and Amphicribral?

Amphicribral vascular bundle is a vascular bundle in which phloem encircles the central strand of xylem. In contrast, amphivasal vascular bundle is a vascular bundle in which xylem encircles the central strand of phloem.