Haworthia fergusoniae Haworthia habdomadis var. inconfluens Haworthia inconfluens Haworthia integra var. standeri Haworthia crystallina Haworthia standeri Haworthia inconfluens var. crystallina Haworthia altilinea f. inconfluens
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024