Bur oak, also known as mossycup oak, is a species of oak tree found in North America. Synonyms for bur oak include Quercus macrocarpa, oak of the prairie, and savanna oak. The tree is known for its large acorns, which have a fuzzy cap that looks like a bur. Its bark is thick and ridged, and the leaves are large, lobed, and green. Bur oak is a popular tree for landscaping and shade, as it can grow up to 100 feet tall. The tree is also valued for its wood, which is used for furniture, flooring, and barrels for aging wine and spirits.