Crataegus tomentosa is a species of hawthorn tree that is commonly known as woolly hawthorn. However, there are several synonyms for this species, including Crataegus lanuginosa, Crataegus drummondii, and Crataegus bartrami. These names all refer to the same tree, which is native to North America and grows to a height of up to 10 meters. The woolly hawthorn gets its name from the fine hairs that cover the branches, leaves, and flowers of the tree. Its fruit is also edible, and can be used to make jams and jellies. Despite its prickly thorns, the woolly hawthorn is a popular ornamental tree, often planted in gardens and parks.