Sapindus, from Latin sapo soap and indicus Indian, the aril of Sapindus saponaria was used as a soap by North American Indians. Chiefly trees and shrubs, sometimes climbing; leaves alternate, simple or compound, terminal leaflet in compound leaves usually reduced to a small spine; domatia common. Flowers often unisexual, petals bear a scale or appendage, stamens usually 8 although basic number is 10, filaments hairy and arise inside the disc. Ovary usually 2-3 locular; fruit usually a capsule, seeds arillate.