Tribulocarpus in J. Bot. 59: 228. 1921 sec. Thulin & al. (2012)
Tribulocarpus belongs to the Sesuvioideae (Klak & al. 2003; Thulin & al. 2012) and is sister to the remaining genera of the subfamily, i.e. Sesuvium(incl. Cypselea), Zaleya and Trianthema. It is the only genus in the Sesuvioideae that includes only C3 species.