There were 2 illustrations found for P. van Rooyen
2 1033227 Trigonotis inoblita F. Muell.Fl. Males., vol. 13 : p. 134, fig. 16 a-e (1997) [P. van Rooyen]
2 1033266 Trigonotis procumbens (Warb.) I.M. Johnst. [80 1083293 Zoelleria procumbens Warb.]Fl. Males., vol. 13 : p. 134, fig. 16 f (1997) [P. van Rooyen]