Petiole Synonyms

The petiole varies in length, being usually shorter than the lamina, but sometimes much longer.

This tissue remains living and is usually formed quiti early, just below the epidermis, where it provides the first periphera support for a still growing stem or petiole.

In general, the petiole is more or less rounded in its form, the upper surface being flattened or grooved.

In the larger veins of the leaf especially in the midrib, in the petiole, and in the young stem, a1 extremely frequent type of mechanical tissue is collenchyma.

A layer of cork is regularly formed in most Phanerogams across the base of the petiole before leaf fall, so as to cover the wound caused by the separation of the leaf from the stem.