There was one illustrations found for U. Frentsch
2 734711 Oxypetalum rusbyi (Malme) Liede & Meve [80 306548 Cynanchum rusbyi Malme]Novon, vol. 11 : p. 174, fig. 2 (2001) [U. Frentsch & J. Conrad]
2 734711 Oxypetalum rusbyi (Malme) Liede & Meve [80 306548 Cynanchum rusbyi Malme]