- leaf (pl. leaves)
- A usually flat, green structure of a plant where photosynthesis and transpiration take place and attached to a stem or branch.
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- leaf axil
- The angle between a petiole and the stem.
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- leaf blight
- Any of various diseases which lead to the browning and dropping of a plant’s leaves.
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- leaf bud
- A bud which contains undeveloped leaves.
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- leaf curl
- A disease that causes leaves to roll up.
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- leaf gap
- A break in a stem's vascular tissue above the leaf trace.
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- leaf litter
- The leaves that have fallen from a plant, either through normal seasonal changes or due to disease. Especially in the latter case, leaf litter can harbor pathogens and should be cleaned up promptly, particularly around plants such as roses. In a naturalized, woodland setting, leaf litter can be a normal part of the workings of the garden.
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- leaf miners
- Tiny grubs that tunnel in leaves leaving whitish blotches or trails.
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- leaf miner
- Any of various insects which, in the larval stage, tunnel through leaves feeding on the tissue and leaving conspicuous traces of their paths.
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- leaf mold
- A form of humus composed of decayed leaves, often used to enrich soil.
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- leaf primordium
- A lateral outgrowth from the apical meristem that develops into a leaf.
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- leaf scar
- The mark left on the twig at the point of attachment of a leafstalk when the leaf falls.
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- leaf spot
- Any of various plant diseases that cause well-defined areas of tissue to die creating noticeable spots.
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- leaf trace
- The strand of vascular tissue between the vascular bundle of the stem and the leaf.
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- compound leaf
- A leaf divided into smaller leaflets.
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- cotyledon (syn. seed leaf)
- One of the first leaves to appear after germination (there may be one, two, or more); the foliar portion of the embryo as found in the seed. See also: true leaf.
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- median leaf-cells
- Cells from the middle of the leaf.
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- seed leaf
- A cotyledon.
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- simple leaf
- A leaf with an undivided blade.
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- true leaf
- A leaf typical of a plant that appears subsequent to the cotyledons.
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