vascular system: Quick Facts

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stem cross section

Diagram comparing xylem and phloem cells, showing labeled illustrations of a vessel member, tracheids, and fiber for xylem on the left, and a sieve element, companion cell, sieve plate, sieve areas, and fiber for phloem on the right.

Diagram showing a tree trunk cross-section with labeled layers: bark, cork, phloem, cambium, xylem, sapwood, and heartwood. Insets A and B illustrate an enlarged xylem vessel for upward water movement and a mature sieve element for downward sugar transport in angiosperms.

How the vascular system works in plants

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