Bipinnate leaf is a specialized type of leaf structure with a central vein that branches into opposite pairs of leaflets, each of which is also divided into smaller leaflets. These smaller leaflets may also have secondary leaflets that can resemble feathers. Synonyms for bipinnate leaf include twice pinnate, double pinnate, and feathery pinnate. Other terms that are often associated with bipinnate leaves include compound leaves and fern-like foliage. Some notable plants with bipinnate leaves include acacias, mesquites, and mimosa trees. The bipinnate leaf structure is an adaptation that allows for efficient light capture, as well as efficient gas exchange and water use.