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The petiole is a stalk that attaches a leaf to the plant stem. In petiolate leaves the leaf stalk may be long (as in the leaves of celery and rhubarb), or short (for example basil). When completely absent, the blade attaches directly to the stem and is said to be sessile.
petiole. The stalk that attaches the leaf lamina to the stem. The point of attachment is often strengthened by a widening of the base of the petiole. Some leaves (sessile leaves) lack a petiole and are joined to the stem at the base of the lamina. Sessile leaves are characteristic of most monocotyledons.
Habitat and Description. This massive woody climber grows in Nepal, Thailand, China, and Korea. The main stem is corky, and the lateral ones are straight and longitudinally fissured. The petiole is 5 cm–15 cm, serpentiform, long, and inflated near the leaf.
Some leaves are attached to the plant stem by a stalklike petiole and are called petiolate leaves (Figure \(\PageIndex{2}\)). Although petioles are narrow and often resemble stems, they are considered part of the leaf.
7 lut 2022 · Although petioles and leaves are highly diverse in size, shape and hence anatomical settings, comparative studies linking petiole structures with leaf parameters or whole-plant size across species and evolutionary lineages are rare.
21 lis 2023 · Leaves that attach with a petiole are known as petiolate, whereas leaves with blades that attach directly to the stem are called sessile leaves. Petioles have several functions .
Anther — The pollen sac on a male flower. Apex — The tip of a shoot or root. Apical dominance — The tendency of an apical bud to produce hormones that suppress the growth of buds below it on the stem. Axil — The location where a leaf joins a stem.
