The most economically important genus in the family is Citrus, which includes the orange (C. sinensis), lemon (C. × limon), grapefruit (C. paradisi), and lime (various, mostly C. aurantifolia, the key lime). Boronia is a large Australian genus, some members of which are plants with highly fragrant flowers and are used in commercial oil production. Other large genera include Zanthoxylum and Agathosma.
Flowers are bractless, solitary or in cyme, rarely in raceme, and mainly pollinated by insects. They are radially or (rarely) laterally symmetric, and generally hermaphroditic. They have four or five petals and sepals, sometimes three, mostly separate, eight to ten stamen (five in Skimmia, many in Citrus), usually separate on in several groups. Usually a single stigma with 2 to 5 united carpels, sometimes ovaries separate and styles combined.
The family is of great economic importance under tropical climates for its numerous edible fruits of the Citrus genus, such as the orange, lime, kumquat, mandarine and grapefruit. Non-citrus fruits include the White sapote (Casimiroa edulis) and the bael (Aegle marmelos). Other plants are grown in horticulture: Murraya species, for example. Ruta, Zanthoxylum and Casimiroa species are medicinals. Several plants are also used by the perfume industry, such as the Western Australian Boronia megastigma.