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brief classification of leaves
Leaves come in different types including broad, needle-like, scale-like, evergreen, and deciduous. Leaves can be simple or compound. Phyllotaxy refers to the arrangement of leaves on the stem such as alternate, opposite, or whorled. Leaf features include venation which is the arrangement of veins, and margin which is the shape of the leaf edge such as entire, crenate, dentate, or lobed.
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brief classification of leaves
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- 2. OBJECTIVES TO DEFINE ANDUNDERSTAND • Leaf Types: broad, needle-like, scale-like, evergreen, and deciduous • Simple versus compound leaves • Phyllotaxy • Venation • Margin
- 3. Leaf Types Leaves areplant organs which are very important to the photosynthetic process. A broad leaf usually consists of the blade (lamina) which is the flattened photosynthetic portion. This type of leaf is usually considered to be deciduous, that is, the leaves drop during the fall and winter. The petiole is the stem-like portion of the leaf, found between the blade and the branch or stem. Leaves without petioles are considered to be sessile. Stipules are leaf-like structures found near thebase of the petiole stipule blade petiole
- 4. Simple and Compoundleaves Simple leaves are whole, undivided leaves growing from a bud on the stem. The node is the part of the stem where leaves are attached Compound leaves are divided into leaflets, growing from one axillary bud on the stem.
- 5. Phyllotaxy Phyllotaxy refers tothe arrangement of leaves on the stem. There are three basic types of leaf arrangement:Trees with alternate arrangement have one leaf at each node. Two leaves at the node, opposite to each other, demonstrate opposite arrangement. Three or more leaves on a node are considered to be whorled.
- 6. Venation Venation deals withthe arrangement of veins. Veins are strands of vascular tissue which appear prominently on the blade.
- 8. Margin Leaf margin dealswith the morphology or shape of the blade. The margin of a leaf is another name for the structure of the leaf's edge.
- 9. There are manydifferent variations Entire Crenate Dentate Serrate Doubly-Serrate Serrulate Incised Lobed Sinuate Undulate