1A. Leaves 7 to 9 lobed (pointed). Large shrubs to small trees.

1b. Leaves 3 to 5 lobed (pointed).....................................................Go to 2.

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2A. Largest leaves much greater than 15 cm wide.

Leaves are 5 lobed. Trees to 100 feet tall...........................Big-leaf Maple

2B. Largest leaves less than 10 cm wide.

Leaves 3 to 5 lobed. Large shrub to small tree (30 feet tall)...........................Douglas' Maple