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glossary of plant terms
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bundle scar - markings within a leaf scar at the location where vascular bundles were broken as the leaf petiole detached from the twig. (also known as bundle traces)

three bundle scars in a Nyssa sylvatica (black gum) leaf scar  hires

u-shaped bundle scar of Oxydendrum arboreum (sourwood)  hires

large bundle scars in the Ailanthus altissima (tree of heaven) leaf scar  hires

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