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Leaflet
 
 
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A leaflet in botany
Botany

Botany, plant science, phytology, or plant biology is a branch of biology and is the Scientific method of plant life and development....
 is a part of a compound leaf
Leaf

In botany, a leaf is an above-ground plant Organ specialized for photosynthesis. For this purpose, a leaf is typically flat and thin, to expose the cells containing chloroplast to light over a broad area, and to allow light to penetrate fully into the tissues....
. A leaflet may resemble an entire leaf, but it is not borne on a stem
Plant stem

A stem is one of two main structural axes of a vascular plant. The stem is normally divided into nodes and internodes, the nodes hold buds which grow into one or more leaf, inflorescence , conifer cones or other stems etc....
 as a leaf is, but rather on a vein of the whole leaf . Compound leaves are common in many plant families. For example, a tomato
Tomato

The Tomato is an herbaceous, usually sprawling plant in the Solanaceae or nightshade family, as are its close cousins Nicotiana, potatoes, aubergine , chilli peppers, and the poisonous Atropa belladonna....
 plant has leaflets on compound leaves.

Leaflets borne on the central vein of a leaf are referred to as pinnae; the compound leaves themselves are described as pinnate.






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A leaflet in botany
Botany

Botany, plant science, phytology, or plant biology is a branch of biology and is the Scientific method of plant life and development....
 is a part of a compound leaf
Leaf

In botany, a leaf is an above-ground plant Organ specialized for photosynthesis. For this purpose, a leaf is typically flat and thin, to expose the cells containing chloroplast to light over a broad area, and to allow light to penetrate fully into the tissues....
. A leaflet may resemble an entire leaf, but it is not borne on a stem
Plant stem

A stem is one of two main structural axes of a vascular plant. The stem is normally divided into nodes and internodes, the nodes hold buds which grow into one or more leaf, inflorescence , conifer cones or other stems etc....
 as a leaf is, but rather on a vein of the whole leaf . Compound leaves are common in many plant families. For example, a tomato
Tomato

The Tomato is an herbaceous, usually sprawling plant in the Solanaceae or nightshade family, as are its close cousins Nicotiana, potatoes, aubergine , chilli peppers, and the poisonous Atropa belladonna....
 plant has leaflets on compound leaves.

Leaflets borne on the central vein of a leaf are referred to as pinnae; the compound leaves themselves are described as pinnate. A plant may be further subdivided in that the pinnae are themselves split into leaflets, or pinnules; these leaves are now twice pinnate, or bipinnate. A few plant species even have tripinnate leaves.