MORPHOLOGY OF LEAF

Leaf is the flattened, lateral outgrowth of the stem or branch. It develops from the nocle from its superficial tissues and has bud in its axil. It is normally green in colour.It has three parts:

1. Leaf base
   
2. petiole
3. Lamina/leaf blade

1. Leaf base:It attached to the stem but in the case of mono cot plant leaf base s expanded and encircle the stem is called sheathing leaf base(leaf sheath).
   
2. Petiole:It is the stalk of leaf in which petiole is absent is called sessile and petiole is present is called percolate.
3. Lamina: It is the terminal expanded portion of leaf.

VENATION: arrangement of veins and vein lets in the lamina of leaf is called venation.Venation is two types i.e.

• Reticulated venation: The leaf in which veins and vein lets from network like structure is called particulate venation .
• Parallel venation: The leaf in which veins and vein lets roughly parallel to each other is called parallel venation.
  

Unicostate: In this type, single mid rib is arise from base to apex of leaf.
Multicostate: In this type, more than one mid rib Costa arises from base to the apex of leaf.