Duvalia caespitosa var. compacta Duvalia caespitosa var. caespitosa
Stapelia caespitosa Duvalia emiliana Duvalia hirtella var. minor Duvalia radiata var. hirtella Duvalia radiata var. minor Duvalia radiata var. obscura Stisseria caespitosa Stissera concolor Stisseria glomerata Stissera hirtella Stisseria laevigata Duvalia hirtella var. obscura
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024