Acer macrophylum Big leaf maple

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Acer macrophyllum (Bigleaf Maple or Oregon Maple) is a large deciduous tree in the genus Acer.

It grows to be up to 35 m tall, but more commonly 15 m to 20 m tall. It is native to western North America, mostly near the Pacific coast, from southernmost Alaska south to southern California. Some stands are also found inland in the foothills of the Sierra Nevada mountains of central California, and a tiny population occurs in central Idaho It has the largest leaves of any maple, typically 15-30 cm across, with five deeply-incised palmate lobes, with the largest running to 61 cm.

The flowers are produced in spring in pendulous racemes 10-15 cm long, greenish-yellow with inconspicuous petals. The fruit is a paired winged samara, each seed 1-1.5 cm diameter with a 4-5 cm wing.

In the more humid parts of its range, as in the Olympic National Park, its bark is covered with epiphytic moss and fern species.

Growing conditions

Bigleaf maple can form pure stands on moist soils in proximity to streams, but are generally found within riparian hardwood forests or dispersed, (under or within), relatively open canopies of conifers, mixed evergreens, or oaks (Quercus spp.).

Lumber

Bigleaf maple is the only commercially important maple of the Pacific Coast region.

The wood is widely used for such diverse uses as furniture, piano frames and salad bowls. Highly figured wood is not uncommon and is used for veneer, stringed instruments and guitar bodies.

The wood is primarily used in veneer production for furniture, but is also used in musical instrument production, interior paneling, and other hardwood products; the heartwood is light, reddish-brown, fine-grained, moderately heavy, and moderately hard and strong Lakwungen First Nations people of Vancouver Island call it the Paddle Tree and used it to make paddles and spindle wheels[citation needed].

In California, land managers do not highly value Bigleaf, and it is often intentionally knocked over and left un-harvested during harvest of Douglas Fir and redwood stands.

Food

Maple syrup has been made from the sap of Bigleaf Maple trees. While the sugar concentration is about the same as in Acer saccharum (sugar maple), the flavor is somewhat different. Interest in commercially producing syrup from Bigleaf Maple sap has been limited. Although not traditionally used for syrup production, it takes about 132 L (35 gal.) of sap to produce 3.8 L (1 gal.) of maple syrup.

Bigleaf is used as browse by black-tailed deer, mule deer, and horses during the sapling stage. A western Oregon study found that 60 percent of bigleaf maple seedlings over 10 inches (25 cm) tall had been browsed by deer, most several times.

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