Feuille

Feuille
Structure d'une feuille: organe chlorophyllien qui est fixé le long d'une tige ou d'un rameau; la photosynthèse se passe ici.
Limbe: partie principale de la feuille.
Nervure latérale: linge divisant, mais pas entièrement, la feuille en lattes.
Nervure centrale: ligne divisant la feuille en deux.
Pétiole: partie de la feuille la reliant à la tige.
Tige: partie de la plante qui porte les feuilles.
Gaine: partie de la feuille qui rattache le pétiole à la tige.
Stipules: point d'insertion de la feuille.

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EN : Leaf
FR : Feuille
ES : Hoja

Feuille

In botany, a leaf is an above-ground plant organ specialized for photosynthesis. For this purpose, a leaf is typically flat (laminar) and thin, to expose the cells containing chloroplast to light over a broad area, and to allow light to penetrate fully into the tissues. Leaves are also the sites in most plants where transpiration and guttation take place. Leaves can store food and water, and are modified in some plants for other purposes. The comparable structures of ferns are correctly referred to as fronds. Furthermore, leaves are prominent in the human diet as leaf vegetables.

A structurally complete leaf of an angiosperm consists of a petiole (leaf stem), a lamina (leaf blade), and stipules (small processes located to either side of the base of the petiole). The petiole attaches to the stem at a point called the "leaf axil". Not every species produces leaves with all of the aforementioned structural components. In some species, paired stipules are not obvious or are absent altogether. A petiole may be absent, or the blade may not be laminar (flattened). The tremendous variety shown in leaf structure (anatomy) from species to species is presented in detail below under Leaf morphology. After a period of time (i.e. seasonally, during the autumn), deciduous trees shed their leaves. These leaves then decompose into the soil. External leaf characteristics (such as shape, margin, hairs, etc.) are important for identifying plant species, and botanists have developed a rich terminology for describing leaf characteristics. These structures are a part of what makes leaves determinant; they grow and achieve a specific pattern and shape, then stop. Other plant parts like stems or roots are non-determinant, and will usually continue to grow as long as they have the resources to do so.

Animation : Feuille