Nemesias -- indigenous to South Africa, flower in spring. Hybrids have been bred and are now grown overseas.
Ixia - a wonderful South African bulb that comes in all colours - there is even a green/turquoise one!
Crocosmia "Lucifer" Crocosmia, montbretia This easy to grow member of the iris family is native to South Africa. Just give it plenty of sun and average moisture (perennial zones 6-9). It's a hummingbird magnet.
The only indigenous South African poppy, Papaver aculeatum, flowering in summer near Rhodes in the Eastern Cape, South Africa.
Sandersonia, a very cool South African plant that I'd like to try growing.
indigenous urgan gardens south africa - Google Search
Ice plant for my south African garden (native to south Africa)
An idea for the side section...
Hesperantha Coccinea - Indigenous South African Bulb - 10 Seeds