Stipules - Notes For Neet

Stipules

Leaf base consists small appendages on both sides are called stipules. 

Leaves having stipulate are called stipulate.

Types Of Stipule - 

A. According to their age -

1. Caducous

2. Deciduous 

3.Persistent 

1. Caducous - 

When stipules detach before leaf unfold then they called caducous. eg , michelia champaca (campa).

2. Deciduous -

Theses stipules detach just after the leaf unfold. eg , cassia , dilenia etc.

3. Persistent - 

These stipules remain attach throughout the life of leaf. eg , rose and china rose.


B. According to their structure and position

1. Free lateral stipule - 

Two free stipules occurs on both sides of leaf base. eg , china rose.

2. Adnate Stipule - 

These are two lateral attached stipule with petiole. eg , rose (rosa indica).

3. Ttendrillar Stiuple - 

These are thin , wiry , structure which helps in climbing called tendrills. eg , smilax.

4. Spiny Stipule - 

Stipules are modified into spines. Which may be long and curved , they perform the function of protection. eg , touch-me-not (Mimosa pudica) , Plum (Zizyphus).