I have been trying to photograph these flowers for months but they are difficult because they are early morning bloomers and close before the late afternoon, which is the only time that the harsh light is soft enough to take useable pictures and I don't do really early mornings. Luckily there was a cloudy morning on Friday and I finally managed to catch them in useable light.
This particular species is Hypoxis obtusa and they are fairly common plants in grasslands although they are also important medicinal plants and some species are becoming rare due to overharvesting. The bulbs of this plant contain Hypoxoside which helps modulate the immune system and is used by HIV+ people as a supplement. It is not a cure but it is a helpful treatment