The seeds of all the taxa of the genus Lithops N.E.Br. are hereby described following their study by both digital dissection microscope and scanning electron microscopy. This information is used together with all other taxonomically important data to suggest the best possible classification for the genus. As a consequence of this new information, L. bella, L. dendritica and L. eberlanzii are reinstated as full species whilst four varieties are elevated to subspecies status. T