have a tubular shaped corolla. On some species, a raised ring or annulus is present in the center of the corolla. Instead of stamens and pistils, Stapeliads contain a pollinarium. List of genera Angolluma Baynesia Caralluma Desmidorchis Duvalia Echidnopsis Edithcolea Frerea Hoodia Huernia Huerniopsis Larryleachia Notechidnopsis Orbea Orbeopsis Piaranthus Pachycymbium Pectinaria Pseudolithos Pseudopectinaria Quaqua Rhytidocaulon Stapelia Stapelianthus Stapeliopsis Tavaresia Tridentea Tromotriche Whitesloanea References and Asclepiadoideae Asterid tribes