Uebelmannia in Succulenta (Netherlands) 46: 159. 1967 sec. Taylor & Zappi 2004
Key literature: Works by Nyffeler (1998), Lüthy & Moser (2002), and Taylor & Zappi (2004).
Category E. No assessment of monophyly has yet been possible, because only a few species were sampled or no phylogenetic study has been conducted so far.