Leaves213-page2

Leaves213-page2 - In some cases, this leads to a very...

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Leaves - 2 Leaf blades may be simple, dissected or compound with leaflets along the petiole (or rachis) along one plane. A compound leaf can be distinguished from a simple leaf by the location of buds. There are no buds in the axils of leaflets. Compound leaves may be pinnately compound or palmately compound. Compound leaves with three leaflets, such as clover, are said to be ternate. The phyllotaxy, or arrangement of leaves on the stem may be helical (sometimes called alternate with one leaf per node), opposite (two leaves per node) or whorled (three or more leaves per node). The number of leaves along a stem before overlapping is called ranking.
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Unformatted text preview: In some cases, this leads to a very ordered arrangement, such as the ranking of leaves on most plants in the mint family or in many grasses. Alternate Opposite Whorled The many variations in leaves provide for better survival in specific habitats. For example, thickened epidermis and epidermal hairs protect and minimize water loss for leaves of dry areas as well as reflect intense sunlight. Large air spaces make floating leaves buoyant. Dissected leaves in water offer less resistance to water force. There are also differences in leaves found in sun and in shade, and in some juvenile and adult leaf forms....
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