Some trees have leaves that have paired lobes . The number and shape of the lobes can be used for identification.

sessile oak leaf

Sessile Oak (Long stalk)

english oak leaf

English Oak (short stalk with two small leaves, known as ears, at the base)

turkey oak leaf

Turkey Oak (deeply cut lobes)

common hawthorn leaf

Common Hawthorn (lobes cut halfway to the midrib)

Swedish Whitebeam leaf

Swedish Whitebeam (6 to 9 lobes)