Liquidambar Maple (Liquidambar styraciflua), commonly called the American sweetgum, sweet-gum (sweet gum in the UK), alligator-wood, American-storax, bilsted, red-gum, satin-walnut, or star-leaved gum, is a deciduous tree in the genus Liquidambar native to warm temperate areas of eastern North America and tropical montane regions of Mexico and Central America. A popular ornamental tree in temperate climates, it is recognizable by the combination of its five-pointed star-shaped leaves and its hard, spiked fruits. It is currently classified in the plant family Altingiaceae, but was formerly considered a member of the Hamamelidaceae. Source: Dr Mary Forrest, UCD.
Link: Wikipedia
Link: Google Images
Link: Royal Horticultural Society, UK
Link: North Carolina State University: catelogue of trees
Link: Keele University, Staffordshire, UK
Link: Plantdatabase.co.uk
Link: Video of Liquidambar Maple aka Sweet Gum
Link: Google Streetview