Reetha (English name: nut, berry, washnut) is used to wash cloths, hair, to improve the shine of jewels. Botanical name: us trifoliatus. cular names (names in other laages): Ritha, Reetha, Aritha, phenil (as it produces froth), risht, rishtak, Pannankottai, punalai, punthi, puvanti, Ritha.