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Types of leaves

Introduction:

  • Leaves are the laterally flattened green structures arising from the nodes.
  • The leaf mainly comprises three parts: Leaf blade or lamina, petiole and leaf base.
  • The leaf can be entire or incised.
  • On the basis of the extent of incisions on the lamina, leaves can be of two types: Simple leaf & Compound leaf.

Detailed Explanation:

1. Simple Leaf:

  • The leaf which has either an entire lamina or if the lamina is incised, the incisions do not touch the midrib or petiole breaking it into a number of leaflets is called a simple leaf.
  • Example: Peepal, mango.
     

simple-leaf-china-rose


2. Compound Leaf:

  • The leaf in which the incisions touch the midrib or petiole such that it breaks the leaf into a number of leaflets is called a compound leaf.
  • Compound leaf can further be divided into two types:

A. Pinnately compound leaf:

  • In a pinnately compound leaf a number of leaflets are arranged in an alternate or opposite fashion on the midrib (rachis).
  • Example: Neem
     

neem


B. Palmately compound leaf:

  • In the palmately compound leaf, the leaflets are attached to the tip of the petiole.
  • It gives the appearance of fingers attached to the palm.
  • Example: Silk cotton.

silk-cotton

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