Age dating palm trees
Because this growth ruptures the epidermis of the stem, woody plants also have a cork cambium that develops among the phloem.
The cork cambium gives rise to thickened cork cells to protect the surface of the plant and reduce water loss.
Trees, as relatively tall plants, need to draw water up the stem through the xylem from the roots by the suction produced as water evaporates from the leaves.
Trees have been in existence for 370 million years.Most angiosperm trees are eudicots, the "true dicotyledons", so named because the seeds contain two cotyledons or seed leaves.