The Norway Maple is one of our commonly occurring trees that sometimes is confused with the Sycamore, another closely related common tree.
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Seen here in leaf, there are a number of clues to look for when trying to distinguish between the two.
The first thing to point out is that the winter bud is red. Seen here on the cusp of opening.
The yellow/pale green flowers are held erect and upright on the bare twig.
The leaf of the Norway Maple is ‘palmate’, and its leaf edge or ‘margin’ is ‘entire’. This means that the very edge of the leaf has smooth unbroken lines and is not serrated like a kitchen knife.