Flora of Scotts Creek Watershed
Acer macrophyllum - Bigleaf Maple
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Family Name: Aceraceae
Common Names: Bigleaf Maple, Canyon Maple
Origin: Native to California
Habitat: Stream banks, moist wooded slopes, and canyons, below 5000 ft.
Life Form and Duration: Perennial Tree, 5-30 m
Comments on overall growth: Crown can be extensive and domed.
Bark and Stem Description: Bark of old trees is thick and deeply fissured. Young twigs are green.
Foliage Type: Deciduous
Foliage Description: Leaves are simple and opposite. Leaf blades are large up to 35 cm wide, palmate with 3-5 lobes and sinuses extending inward ~ 50% of lobe length, margins with large coarse teeth. Under surface of leaf is more pubescent than upper surface. Petioles are red, exude a milky sap, and range in length from 5-12 cm.
Infloresence Description: Long pendant raceme, with greater than 30 small flowers. Both staminate and pistillate flowers on same raceme.
Flower Description: Flowers are small, petals are yellowish-green.
Flowering Season: April-May
Fruit Type: Pair of long winged achenes (double samara)
Fruit Description: Seeds tawny in color when mature, wings at an angle less than 90 degrees.