Pinnately compound leaves

Pinnately compound leaves:

In a pinnately compound leaf, the leaflets are borne on a general axis termed as the rachis. The leaflets are termed as the pinnae. The pinnately compound leaf might be of the kind:

a. Unipinnate
b. Bipinnate
c. Tripinnate
d. Decompound

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Figure: Types of Pinnately compound leaves

Unipinnate:

In this form, the pinnae are borne directly on the rachis. Whenever the number of leaflets is odd, it is supposed to be imparipinnate, example: Neem. Whenever the number of leaflets is even it is said to be paripinnate, example: Tamarind.

Bipinnate:

In this form of compound leaves, the primary rachis is branched to generate secondary rachis that bears the leaflets. Example: Acacia.

Tripinnate:

In this form the secondary rachis generates the tertiary rachis that bears the leaflets, example: Moringa.

Decompound:

Whenever the compound leaf is more than thrice pinnate it is stated to be decompound. Example: Coriander.

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