. Explain the Type of Compound Leaf

Best Answer

Types of Compound Leaf:

1. On the basis of mode of lamina incisions reaching upto mid rib or petiole, compound leaves are of two types, pinnate and palmate.

 Pinnate compound Leaf: In this type, incisions reach up to different points of the mib-rib. It may be of following types:

i. Unipinnate: Leaflets are borne directly on rachis. It is of two types:

ii. Paripinnate: Leaflets are borne in pairs i.e., even number of leaflets, e.g., tamarind (Tamarindus indicus), amaltas (Cassia fistula), etc.

iii. Imparipinnate: The rachis is terminated by an unpaired odd leaflet, e.g., rose (Rosa indica), neem (Azadirachta indica), etc.

iv. Bipinnate: The pinnae are dissected again into pinnules so that they are borne on secondary axes known as rachillae or rachules, e.g.. Acacia, Mimosa, Caesalpinia, etc.

v. Tripinnate: Here pinnules are borne on tertiary axes, e.g., drumstick (Moringa pterigosperma), etc.

Decompound: Here division of rachis occurs more than three times. The rachis and its branches become flattened while the pinnules are largely suppressed, e.g., coriander, carrot, fennel, etc.


2. Palmate compound leaf: In this type, incisions of lamina reach upto the base of mid rib. The rachis does not develop at all. The petiole bears leaflets in this type. Depending upon the number of the leaflets present, a palmate compound leaf may be:

i. Unifoliate: Only a single leaflet is articulated to the top of the winged petiole. The articulation shows that the leaf is not a simple one but compound, e.g., Citrus sp.

ii. Bifoliate: The petiole bears two leaflets, e.g., Balanites, Hardwickia, etc.

iii. Trifoliate: The petiole bears three leaflets, e.g., Aegle, Hydrocotyl, Desmodium, etc.

iv. Quadrifoliate: Four leaflets are present at the apex of petiole, e.g., Paris quadrifolia.

v. Pentafoliate: Five leaflets are present at the apex of petiole, e.g., hurhur (Gynandropsis pentaphylla).

vi. Multifoliate: More than five leaflets are present at the apex of petiole, e.g., Bombax malabarica, Cleome viscosa, etc.




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