Chris Burger's 1990 check list.
(seems to include species no where near De Hoop)
Not found: Acrostemon vernicosus, Argyrolobium canescens, Athanasia dimorpha dimorpha, Atriplex semibaccata typica, Bulbinella barkerae, Ficinia argyropa, Gibbaeum austricalum, Ischyrolepis leptoclados, Lobelia comosa foliosa, Marasmodes duemmeri, Muraltia empleuridioides diversifolia, Scopologena gracilis,