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brief classification of leaves


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brief classification of leaves

  2. 2. OBJECTIVES TO DEFINE AND UNDERSTAND • Leaf Types: broad, needle-like, scale-like, evergreen, and deciduous • Simple versus compound leaves • Phyllotaxy • Venation • Margin
  3. 3. Leaf Types Leaves are plant 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. 4. Simple and Compound leaves 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. 5. Phyllotaxy Phyllotaxy refers to the 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. 6. Venation Venation deals with the arrangement of veins. Veins are strands of vascular tissue which appear prominently on the blade.
  7. 7. Margin Leaf margin deals with the morphology or shape of the blade. The margin of a leaf is another name for the structure of the leaf's edge.
  8. 8. There are many different variations Entire Crenate Dentate Serrate Doubly-Serrate Serrulate Incised Lobed Sinuate Undulate