There was one illustrations found for C. Hajec
Fenestraria rhopalophylla (Schltdl. & Diels) N.E. Br. [Mesembryanthemum rhopalophyllum Schltr. & Diels] H.W.R. Marloth, Fl. S. Afr. (Marloth), vol. 1 : t. 52, fig. A (1913) [C. Hajec]
Fenestraria rhopalophylla (Schltdl. & Diels) N.E. Br. [Mesembryanthemum rhopalophyllum Schltr. & Diels]