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These trees are both tall and large in diameter and, in particular, hold a large diameter high up the trunk. Measurement is very complex, particularly if branch volume is to be included as well as the trunk volume, so measurements have only been made for a small number of trees, and generally only for the trunk.
Acer macrophyllum, the bigleaf maple [2] or Oregon maple, [3] is a large deciduous tree in the genus Acer. It is native to western North America. In addition to uses by animals, it is of some culinary and woodworking interest. Large Acer macrophyllum leaf in Washington State
The leaves are large and deep green, but lack the brown indumentum on their undersides which make other cultivars so distinctive. 'Angustifolia', developed in France in 1825, has narrow, spear-shaped leaves 20 cm (7.9 in) long by 11 cm (4.3 in) wide, as its name suggests.
Its massive, bright green leaves are paired with enormous, fragrant flowers.
Trees may produce sprouts from their stumps subsequent to injury, until about 20 years old; however, shoots do not form on the stumps of more mature trees as they do on coast redwoods. Giant sequoias of all ages may sprout from their boles when branches are lost to fire or breakage. A large tree may have as many as 11,000 cones.
Most Catalpa are deciduous trees; they typically grow to 12–18 metres (40–60 ft) tall, with branches spreading to a diameter of about 6–12 metres (20–40 ft). They are fast growers and a 10-year-old sapling may stand about 6 metres (20 ft) tall. They have characteristic large, heart-shaped leaves, which in some species are three-lobed.