A fast, often multi-stemmed evergreen wattle of 6 to 30 m with sickle-shaped leaf-like phyllodes, yellow flower spikes and twisted ear-shaped pods.

Britain's only native maple, a neat tree of up to 20 m with small lobed leaves that turn rich gold in autumn and corky-winged twigs.

A small, often multi-stemmed maple (now treated botanically as Acer tataricum subsp.

The largest maple in North America, with the biggest leaves of any maple (up to a foot across) that emerge burgundy, mature glossy green and turn yellow-orange in fall.

A fast, irregular, round-crowned tree and the only native maple with compound leaves, with green young twigs and little fall color.

A dense, rounded shade tree with broad five-lobed leaves whose stalks ooze milky sap when broken, gold flower clusters before the leaves, flat-winged seeds and dull yellow fall color.

A big, fast-growing maple to 35 m with five-lobed leaves and winged seeds that germinate everywhere.

One of the most widely planted shade trees in the eastern US, fast-growing to 40-70 feet with red flowers in late winter, red seeds in spring and reliable red or yellow fall color.

A large, dense, oval shade tree with gray-brown bark that furrows into plates and five-lobed leaves that turn brilliant yellow, orange and red in fall, often all on one tree.

The unmistakable 'upside-down tree', 10 to 25 m tall with a swollen water-storing trunk that can reach 28 m in girth and live more than 1,000 years.

New Zealand's giant, a conifer typically 30 to 60 m tall with a smooth grey branch-free trunk 3 to 4 m (rarely 7 m) across and a huge spreading crown.

A fast, weedy tree (40-60 feet) with long compound leaves that smell like burnt peanut butter when crushed, smooth gray bark and clusters of papery winged seeds.

A flat-topped, umbrella-shaped small tree (20-40 feet) with ferny leaves and fluffy pink powder-puff flowers in early summer that hummingbirds visit.

A conical to rounded tree of around 28 m with sticky young leaves, dark woody cones and roots that fix nitrogen with the bacterium Frankia.

The largest North American alder and the Northwest's main hardwood: a fast, straight tree with smooth mottled gray bark (often painted with white lichen), serrated leaves with rolled-under edges that drop green, reddish catkins in late winter and small woody cones that hang on all winter.

A small, often multi-stemmed tree with smooth silvery-gray bark and a four-season show: clouds of white flowers in early spring, sweet blueberry-like fruit in June that birds strip within days, and orange-red fall color.

An unmistakable conifer, 25 to 35 m tall, whose branches rise like a candelabra to a flat crown, with sharp scale-like leaves and large cones of edible pinhão seeds sold at roadsides every winter.

A broadleaf evergreen with smooth cinnamon-red bark that peels in papery sheets to reveal pale green new bark, glossy leathery leaves, clusters of white urn-shaped flowers in spring and orange-red berries in fall that robins, waxwings and band-tailed pigeons devour.

The world's most widespread and most cold-tolerant mangrove, a shrub or small tree of 2 to 12 m with grey-backed leathery leaves and carpets of pencil-like breathing roots (pneumatophores) rising from the mud.

A tough, usually evergreen shade tree of about 15 m (to 30 m) with a dense round crown of glossy pinnate leaves, honey-scented flowers and olive-like fruit.

A fast-growing, usually multi-trunked tree (30-70 feet) with cinnamon-colored bark that peels in papery curls, the only birch that thrives in the hot, humid South.

A northern tree famous for chalk-white bark that peels in papery strips to show orange-pink beneath, with dark green leaves that turn bright yellow.

A graceful pioneer tree with white peeling bark and fine drooping twigs, reaching up to 30 m but usually smaller in gardens.

A massive, dense evergreen shade tree of 15 to 30 m with glossy leaves that smell of camphor when crushed and black berries that birds spread everywhere.

A tough tree of up to 30 m with fluted grey trunk, pleated oval leaves and papery winged nutlets eaten by hawfinches.

The Texas state tree: a huge, long-lived shade and nut tree that can pass 100 feet on good river-bottom soil.

A medium-sized deciduous tree of about 10 m that drops its leaves in the hot season and then hangs itself with 30 to 60 cm chains of golden flowers, followed by long black pods.

A long-lived tree of up to 35 m with spirally fissured bark, long serrated leaves and spiny husks holding edible chestnuts.

A giant emergent of tropical forest with a straight grey trunk studded with prickles when young, enormous plank buttresses and a flat-topped crown far above the canopy.

An elm-like tree with a broad arching crown and gray bark covered in distinctive corky warts and ridges.