This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
A large order of trees and shrubs, chiefly from tropical countries. Leaves usually alternate, pinnate, trifoliolate or simple. Flowers hermaphrodite or polygamous. Ovary usually 1-celled, with a solitary ovule pendulous from a funicle rising from the base of the ovary.