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Some characteristics to distinguish between Acer platanoides and Acer saccharum

Plant part
Acer platanoides
Norway Maple
Acer saccharum
Sugar Maple
Leaf blade 5-lobed, sharp pointed 3-5-lobed, round pointed
Petiole, when removed from stem Exudes a milky sap No sap visible
Fruit (samara) Large, wide spreading, nearly horizontal Smaller, horseshoe-shaped
Bark Narrow ridges with shallow furrows Irregular, fairly wide ridges, sometimes scaly
Terminal buds Large, rounded, plump Smaller, sharp pointed