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18 sty 2024 · Leaves that do not have a petiole and are directly attached to the plant stem are called sessile (apetiolate) leaves (Figure \(\PageIndex{4}\)). In a special type of sessile leaves called perfoliate leaves, the stem passes through the center of the blade (Figure \(\PageIndex{4}\)).
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.
17 gru 2016 · The petiole is the stalk that supports a leaf in a plant and attaches it to the stem. Many people often call it a stem, which is incorrect. A stem is the part of the plant that serves as the main source of support and produces nodes and roots, and that’s not what we observe in petioles.
Leaves with petiole are called petiolate while those without petiole, are called sessile. They may be short or long and cylindrical. Sometimes, it is flattened as in the case of lemon. Then it is described as winged-petiole. In some plants the petiole undergoes modification to form the tendrillar-petiole which help the plant to climb. Example ...
The Petiole. Most leaves have a stem that attaches the blade of the leaf to the rest of the plant. This is the petiole. However, in some plants, the leaves do not have a petiole and the blade is directly attached to the plant stem. These leaves are sessile (lacking a petiole).
In general, leaves may be petiolate, with a petiole, or sessile, without a petiole. Leaflets of a compound leaf are, correspondingly, either petiolulate or sessile . (The term subsessile is sometimes used for a leaf/leaflet with a small, rudimentary petiole/petiolule.)
In our observations, we identified five different petiole outlines: circular, with indentation (terete petiole), flattened horizontally, flattened vertically and polygonal. We found that those with an indentation and polygonal outline tend to occur in longer petioles from taller trees, while circular outlines tend to be more frequent in shorter ...
