principle objective of this lecture is to present on Leaf Structure and Phyllotaxy in Plants. Leaf is the flattened outgrowth of Stem or a branch that develops at node & has a bud in it’s axil. These are the dissimilar organs & are meant primarily for Photosynthesis, Respiration and Transpiration. The part of leaf that connects the lamina with stem, is called leaf petiole. Some time a leaf may not have a petiole, such leaves are called – Sessile otherwise the leaf is called Petiolate. Main purpose of this lecture is to awareness about the structure of a typical leaf & the types of Phyllotaxy in plants for their mode of arrangement.