Haworthiopsis

Gildenhuys, Sean D. & Klopper, Ronell R., 2016, A synoptic review and new infrageneric classification for the genus Haworthiopsis (Xanthorrhoeaceae: Asphodeloideae), Phytotaxa 265 (1), pp. 1-26 : 19

Haworthiopsis hybrids

Even though Haworthiopsis species often co-occur with, or are found in close proximity to, species of Haworthia and Tulista , intergeneric hybrids are extremely rare ( Rowley 2014: 21). Occasionally two species of Haworthiopsis are found in close proximity, usually H. viscosa with one of the other species, and this co-occurrence occasionally results in the presence of natural hybrids. Hybrids are known between H. viscosa and the following taxa: H. fasciata , H. glauca , H. longiana and H. scabra , some of which that are fertile. Bayer (1999) has also reported a natural hybrid between H. sordida and H. woolleyi .