Simarubaceæ, a natural order of trees and shrubs, with alternate, generally compound leaves, without stipules; regular, generally hermaphrodite flowers. The species are not numerous; they are found in the tropical parts of Asia, Africa, and America. The whole order is characterised by great bitterness, and several of the species are used as tonics in dysentery, &c. Quassia (q.v.), Bitterwood (q.v.), and Ailanto (q.v.) belong to it.
Simaruba is itself a genus with several species, all belonging to tropical America.