Earthwatch Institute's Urban Tree Project: Cambridge, MA

Tilia cordata (Small-leaved Lime, occasionally Small-leaved Linden or Little-leaf Linden) is a species of Tilia native to much of Europe and western Asia, north to southern Great Britain (north to about Durham), central Scandinavia, all over Romania, east to central Russia, and south to central Spain, Italy, Bulgaria, Turkey, and the Caucasus; in the south of its range it is restricted to high altitudes. less ↑

Acer rubrum (Red Maple, also known as Swamp or Soft Maple), is one of the most common and widespread deciduous trees of eastern North America. It ranges from the Lake of the Woods on the border between Ontario and Minnesota, east to Newfoundland, south to near Miami, Florida, and southwest to east Texas. Many of its features, especially its leaves, are quite variable in form. At maturity it often attains a height of around 15 m (50 ft).... less ↑

The European Pear Pyrus communis is a species of pear native to central and eastern Europe and southwest Asia. The European Pear is one of the most important fruits of temperate regions, being the species from which most orchard pear cultivars grown in Europe, North America and Australia are developed. Two other species of pear, the Nashi Pear, Pyrus pyrifolia, and the Chinese white pear bai li, Pyrus × bretschneideri, are more widely used in eastern... less ↑

Tilia americana is a species of Tilia, native to eastern North America, from southeast Manitoba east to New Brunswick, southwest to northeast Texas, and southeast to South Carolina, and west along the Niobrara River to Cherry County, Nebraska. Common names include Basswood (also applied to other species of Tilia in the timber trade) and American Linden or the Lime-Tree. less ↑

The Northern Red Oak or Champion Oak, Quercus rubra (syn. Quercus borealis), is an oak in the red oak group (Quercus section Lobatae). It is a native of North America, in the northeastern United States and southeast Canada. It grows from the north end of the Great Lakes, east to Nova Scotia, south as far as Georgia and states with good soil that is slightly acidic. Often simply called "Red Oak", northern red oak is formally... less ↑

Ulmus americana, generally known as the American Elm or, less commonly, as the White Elm or Water Elm, is a species native to eastern North America, occurring from Nova Scotia west as far as British Columbia, from northern Alberta at the top of its range, south to Florida and central Texas. It is an extremely hardy tree that can withstand winter temperatures as low as −42 °C (−44 °F). Trees in areas unaffected by Dutch elm... less ↑

Acer campestre, common name Field Maple, is a maple native to much of Europe, north to southern England (where it is the only native maple), Denmark, Poland and Belarus, and also southwest Asia from Turkey to the Caucasus, and north Africa in the Atlas Mountains. In North America it is known as Hedge Maple and in Australia it is sometimes called Common Maple. less ↑

Robinia pseudoacacia, commonly known as the Black Locust, is a tree in the subfamily Faboideae of the pea family Fabaceae. It is native to the southeastern United States, but has been widely planted and naturalized elsewhere in temperate North America, Europe and Asia and is considered an invasive species in some areas. A less frequently used common name is False Acacia, which is a literal translation of the specific epithet. It was introduced into Britain in... less ↑

Ulmus pumila, the Siberian Elm, is native to Central Asia, eastern Siberia, Mongolia, Xizang (Tibet), northern China, India (northern Kashmir) and Korea . It is also known as the Asiatic Elm, Dwarf Elm and (erroneously) Chinese Elm. Two varieties are recognized: var pumila and var. arborea, the latter known as Turkestan elm. Ulmus pumila has been widely cultivated throughout Asia, North America and, to a lesser extent, southern Europe. less ↑

Plants in the genus Carpinus (Cár-pi-nus) are commonly called Hornbeams. They are relatively small hardwood trees. Many botanists place the hornbeams in the birch family Betulaceae, though some group them with the hazels (Corylus) and hop-hornbeams (Ostrya) in a segregate family, Corylaceae. The 30-40 species occur across much of the north temperate regions, with the greatest number of species in east Asia, particularly China. Only two species occur in Europe, and only one in eastern North... less ↑

Liriodendron (pronounced /ËŒlɪriɵˈdÉ›ndÉ™n/) is a genus of two species of tree in the Magnoliaceae family, known under the common name Tulip tree (although it is unrelated to the tulip). Liriodendron tulipifera is native to eastern North America, while Liriodendron chinense is native to China and Vietnam. Both species are large deciduous trees. Various extinct species have been described from the fossil record. less ↑

Koelreuteria bipinnata, also known as (Chinese flame tree, Chinese golden rain tree, Bougainvillea golden-rain tree") is a species of Koelreuteria native to Asia, particularly to China. It is a small to medium-sized deciduous tree growing between 10–20 meters tall. They are also one of the few trees that bloom in the summer. They can live from 50 to 150 years. less ↑

Styphnolobium japonicum (L.) Schott , the Pagoda Tree (Chinese Scholar, Japanese pagodatree; syn. Sophora japonica) is a species of small tree or shrub in the subfamily Faboideae of the pea family Fabaceae, formerly included within a broader interpretation of the genus Sophora. The species of Styphnolobium differ from Sophora in lacking the ability to form symbioses with rhizobia (nitrogen fixing bacteria) on their roots. It also differs from the related genus Calia (mescalbeans) in having deciduous... less ↑