A component of the primary phloem that develops often following the differentiation of the protophloem.


Metaphloem, together with protophloem, constitutes the primary phloem. Although they look similar, the protophloem can be seen near the exterior whereas the metaphloem is located adjacent to the metaxylem. The protophloem develops first but is more sensitive to stretch or mechanical stress thus often does not develop fully compared to the metaphloem that attains full development when the plant reaches maturity, or when the internodes stopped from elongating.

Word origin: Greek meta (beside, after) + phloem

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