TYPES OF LEAF VENATION

LEAF VENATION

  • Plant leaf venation refers to the arrangement of veins in a leaf.
  • Veins in a plant leaf help in the circulation or distribution of water and mineral salts.

Types of leaf venation.

  1. Network leaf venation
  2. Parallel leaf venation

Network of leaf venation

This is where veins make a net in a leaf as they cross each other .

Examples of plants with a network leaf venation.

  • Cowpeas
  • Beans
  • Soya beans
  • Hibiscus
  • Ground nuts
  • Oranges
  • Coffee
  • Jack fruit
  • Pawpaw
  • Avocado

Illustration of a network leaf venation

a network leaf venation

note: Network venation is commonly in dicotyledonous.

Parallel Leaf venation.

This is where veins run from the leaf stalk to the apex and don’t cross each other.

Parallel leaf venation is commonly in monocotyledonous plants.

Examples include.

  • Maize
  • Millet
  • Rice
  • Spear grass
  • Sorghum
  • Wheat
  • Barley
  • Sugar cane. etc

Illustration of a parallel leaf venation

parallel leaf venation

Note:

  • Parallel leaf venation is mainly found in simple entire leaves.

Learner’s activity

  1. Write one sentence to show the meaning of the following;
  2. Venation
  3. Parallel venation
  4. Draw the structure of a simple lobed leaf
  5. Give two examples of compound leaves