By Bruce Bayer concept
A. The subgenus Haworthia
B. The subgenus Hexangularis
| attenuata | bruynsii | coarctata |
| fasciata | glabrata | glauca |
| koelmaniorum | limifolia | longiana |
| nigra | pungens | reinwardtii |
| scabra | sordida | venosa |
| viscosa |
C. The subgenus Robustipedunculares
| kingiana | marginata | minima |
| pumila |