Leaf axil
/lif ˈæksəl/
Definition
Leaf axil refers to the upper angle formed where a leaf stalk or leaf base joins the stem. It is a plant structure and a key point of growth, because axillary buds commonly develop there and can produce side shoots, branches, or flowers. This distinguishes it from a node, which is the broader stem region where leaves, buds, and branches attach.
Function in Plants
- Axillary bud site: The leaf axil is where an axillary bud usually forms. That bud can stay dormant or grow into a side shoot, which helps determine branching and overall plant shape.
- Flower and inflorescence position: In many species, flowers or flower clusters develop from the leaf axil. Their position can affect how the plant displays blooms and is often used in plant identification.
- Control of branching: Growth from buds in the leaf axil is influenced by apical dominance, the effect of the main shoot tip suppressing side growth. When the tip is removed or weakened, axillary buds may start growing more actively.
- Useful point for pruning and cuttings: Gardeners often prune just above a node so buds in the leaf axil can produce new shoots. On cuttings, these areas are also important because they contain active tissues linked to new growth.
Related Terms
Node
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Terminal bud
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Internode
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Petiole
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Leaf
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Stem
Stem refers to the main aboveground plant structure that supports leaves, buds, flowers, and fruits, and connects them…
Joint
In plant use, a joint usually means a node, the point on a stem where one segment meets the next. It is the place where…