Buds and Leaf Scars
Bundle traces
The bundle trace or bundle scar is the pattern left by the vascular bundle
connection in the leaf scar after the leaf abscises.
They can be separated based on the number and shape of the bundle traces.
Less than three traces
Single
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More than three traces
Separate
Three
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Scattered
Continuous
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Buds and Leaf Scars
Bundle traces
A single bundle trace is located in the center of the leaf scar.
Bud
Leaf scar
Bundle trace
Forsythia
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Buds and Leaf Scars
Bundle traces
Three bundle traces is a common form found in a leaf scar.
Bud
Leaf scar
Bundle trace
Seven-son flower
(Heptacodium)
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Buds and Leaf Scars
Bundle traces
In leaf scars with numerous separate bundle traces are usually spaced along the
perimeter of the leaf scar.
Bud
Leaf scar
Bundle trace
Horsechestnut
(Aesculus)
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Buds and Leaf Scars
Bundle traces
Leaf scars may also have numerous bundle traces that are scattered in
the leaf scar.
Bud
Leaf scar
Bundle trace
Magnolia
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Buds and Leaf Scars
Bundle traces
Leaf scars with more than three bundle traces can be in a continuous
shape resembling a single U-shape, C-shape or oval-shape in the leaf scar.
Bud
Leaf scar
Bundle trace
Ash
(Fraxinus)
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