Leaflet
/ˈliflɛt/
Definition
Leaflet refers to one of the individual blade-like sections of a compound leaf, where a single leaf is divided into separate parts attached to a shared stalk or central axis. Unlike a true leaf, a leaflet does not have a bud at its base. This difference helps distinguish compound leaves from several simple leaves growing along a stem. Leaflets occur in many plants, including palms, ash, and clover.
Botanical Significance
- Identification value: The number, shape, edge, and arrangement of leaflet parts are key traits used to identify many plants, especially in groups with compound foliage such as roses, ashes, and legumes.
- Independent movement: In some species, each leaflet can fold or change angle in response to light, touch, or daily rhythms, helping regulate light capture and water loss.
- Damage patterns: Looking at which leaflet parts are chewed, spotted, or yellowing can help narrow down pest, disease, or nutrient problems on compound leaves.
- Growth and replacement: Because leaflet parts are subdivisions of one leaf, losing one does not mean the plant has lost several separate leaves, which helps when assessing storm, insect, or pruning damage.
Related Terms
Leaf
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Leaf blade
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Petiole
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Pinnate
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Palmate
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Rachis
Rachis is the main axis of a compound structure in plants, especially the central stem-like part of a compound leaf or…