Sapindus mukorossi Identity & Plant Part
The botanical entity is Sapindus mukorossi Gaertn., a deciduous tree of the Sapindaceae grown in the Himalayan foothills and across Asia. The part used is the fruit, and in practice the outer husk that surrounds the hard black seed. The seed is not part of this ingredient, and neither are leaves or bark.
Despite the name, the soap nut is not a true nut but a berry-like drupe. It is often confused with soapwort and with Quillaja bark, two other lather-forming materials from unrelated plants. Soap nut husk is rich in triterpene saponins, which give the strong foaming action, and also carries sugars and organic acids.












