Bicollateral Bundle

Also found in: Medical.

bicollateral bundle

[‚bī·kə′lad·ə·rəl ′bənd·əl]
A vascular bundle in which phloem is located both externally and internally with respect to the xylem, with all tissues lying on the same radius and with the internal phloem lying next to the pith.

Bicollateral Bundle


(in plants), a conducting bundle in which two shafts of phloem adjoin the wood from the outer and inner sides. The bicollateral bundle consists of one complete collateral bundle and a closely adjoining incomplete bundle. A bicollateral bundle is characteristic of the stems of members of the Cucurbitaceae and Solanaceae families.

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