the world > plants > particular plants > cultivated or valued plants > plants yielding soap > [noun] > soap-plant
amole1831
soap-plant1847
soap-bulb1874
1874 J. Lindley & T. MooreTreasury Bot. (rev. ed.) Suppl. 1279/2Chlorogalum pomeridianum... The bulbous root, when rubbed in water, makes a lather..: hence it is known as the Soap-bulb.