Abstract:
Haworthiopsis was established in 2013 to accommodate the species formerly classified under the subgenus Hexangulares
of the genus Haworthia. This new genus is near-endemic to South Africa and found in most of the provinces of the
country. It is also known from southern Namibia, Swaziland and possibly Mozambique. A total of 18 species are currently
recognised in Haworthiopsis. However, this circumscription renders the genus paraphyletic with H. koelmaniorum sister
to a polytomy comprising the rest of the Haworthiopsis taxa and Gasteria. In this contribution, seven new combinations
are published (H. fasciata var. browniana, H. reinwardtii var. reinwardtii f. chalumnensis, H. reinwardtii var. reinwardtii f.
kaffirdriftensis, H. reinwardtii var. reinwardtii f. olivacea, H. tessellata var. crausii, H. viscosa, H. scabra var. smitii) and
two changes of status (H. koelmaniorum var. mcmurtryi, H. viscosa var. variabilis). An amplified description of the genus
is provided. Six sections formerly recognised under Haworthia (subg. Hexangulares) are applied and adapted to Haworthiopsis,
with some amendments. A new section, H. sect. Koelmaniorum, is described here. New combinations for hybrid
taxa in Haworthiopsis that were previously described as species of Haworthia are given.
