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- This article is about the plant organ. See leaf (disambiguation) for other meanings.
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 (chlorenchyma tissue) 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 respiration, 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. Leaves are prominent in the human diet as leaf vegetables.
Leaf anatomy
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 point at which the petiole attaches to the stem is called the leaf axil. Not every species produces leaves with all of these structural parts. 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 types, arrangements, and forms.A leaf is considered to be a plant organ, typically consisting of the following tissues:
- An epidermis that covers the upper and lower surfaces
- An interior chlorenchyma called the mesophyll
- An arrangement of veins (the vascular tissue).
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Looking forward to tomorrow-boxes of fresh flowers, berries and foliages arriving at the studio. Designing all day- LOVE IT LOVE IT LOVE IT!
permanentpetals (Michelle VandenBosch) Wed, 16 Dec 2009 22:42:26 -0000
Looking forward to tomorrow-boxes of fresh flowers, berries and foliages arriving at the studio. Designing all day- LOVE IT LOVE IT LOVE IT!
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Looking forward to tomorrow-boxes of fresh flowers, berries and foliages arriving at the studio. Designing all day- LOVE IT LOVE IT LOVE IT!
permanentpetals (Michelle VandenBosch) Wed, 16 Dec 2009 22:42:26 -0000
Looking forward to tomorrow-boxes of fresh flowers, berries and foliages arriving at the studio. Designing all day- LOVE IT LOVE IT LOVE IT!
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