Sugar Maple Identification Guide

Key Identifying Features

Sugar maple (Acer saccharum) is the classic maple of the Canadian flag and of New England fall color. Identify it by its five-lobed leaves with smooth, untoothed lobe edges, rounded U-shaped notches between lobes, and a stately, rounded crown. It is the source of maple syrup.

• Large tree, 60-100 ft (18-30 m) tall
• Opposite leaves and buds
• Leaf lobes without fine teeth, edges smooth and wavy

Leaves & Stems

Leaves are 3-6 in across with typically five lobes. The hallmark is the smooth (entire) margins of the lobes with a few large blunt teeth or wavy points but no fine serrations, and the rounded, U-shaped sinuses between lobes. The underside is pale green but not whitish. Leaf stalks are not milky (no white sap). Twigs are slender, reddish-brown to gray, and bear sharply pointed, brown, scaly buds - a key winter feature distinguishing it from red maple's rounded red buds.

Flowers & Fruit

Sugar maple flowers in spring as leaves emerge, producing drooping clusters of small, greenish-yellow flowers on long thread-like stalks - much less showy and later than red maple's bright red blooms. The fruit is a paired, horseshoe-shaped samara about 1 in long; the two wings are nearly parallel or only slightly spread. Seeds mature in autumn.

How to Tell It Apart from Look-Alikes

• Red maple (Acer rubrum): Toothed lobe margins, whitish leaf undersides, red buds; sugar maple has smooth margins and brown pointed buds.
• Norway maple (Acer platanoides): Very similar leaf shape, but broken leaf stalks ooze milky white sap, and its samara wings spread wide nearly horizontally. Sugar maple has clear sap and narrowly angled samaras.
• Black maple (Acer nigrum): A close relative with drooping, often three-lobed leaves and downy undersides.
• The decisive cues: smooth-edged lobes, U-shaped sinuses, clear (non-milky) sap, and sharp brown buds.

Where You'll Find It

Sugar maple is a dominant hardwood of cool, moist, well-drained upland forests in northeastern North America and the Great Lakes region. It prefers rich soils and is shade-tolerant, common in mature deciduous and mixed forests and widely planted as a shade and street tree.

Quick ID Checklist

• 5-lobed leaves with smooth (untoothed) lobe margins
• Rounded U-shaped notches between lobes
• Leaf underside pale green, not whitish
• Clear sap (snap the stalk - no milky liquid)
• Sharp-pointed brown buds
• Samaras nearly parallel, ripening in fall; orange-red fall color