Pilbeam (1981) suggests that plants cultivated under this name may be sparsely hairy forms of M. hahniana. Hunt considers M. saetigera a synonym of M. brauneana.
Source: (1997). Cactaceae. In: . Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.
