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18 sty 2024 · 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. A petiolate leaf thus consists of the blade and the petiole.
The petiole is a stem that attaches the leaf blade to the main stem of the plant. As plants have radiated, diversified, and adapted to different environments, you'll see that there are many variations on this theme. The photo on the left is a palmate leaf, the diagram on the right is a pinnate leaf. Photo by Maria Morrow, CC-BY 4.0. Diagram on ...
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.
First, the distinction is valid only over a population of plants, and not necessarily for all individuals, especially not young plants. For example, a photo showing a group of plants with long petioles (Travis Co.) posted at the Lady Bird Johnson Wildflower Center can only represent C. texana.
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.
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.)
