A succulent plant that keeps growing from year to year. The stems lie along the ground and are 2 m long. The leaves are long and thin and triangle shaped in cross section. The base of the flower is double ridged. The flowers are pink or light purple. The fruit are green and shaped like a top and there are many small seeds in the slimy pulp.
Flores, bracteae et calycis lobi minores quam in M. eduli. Styli ut recte observavit cl. De Candolle: Stigmata decem, brewissima, e viridi fusca, quasi coalita in unicum stigma decemdentatum. Cl. Haworth ipse M. dimidiatum suum cum figura Candolleana identicum declaravit in Revis. l. c.