Aberia caffra Harv. & Sond. Kai apple. Kau apple. Kei apple. South Africa. The fruits are of a golden-yellow color, about the size of a small apple. They are used by the natives for making a preserve and are so exceedingly acid when fresh that the Dutch settlers prepare them for their tables, as a pickle, without vinegar. Sturtevant, Notes on edible plants, 1919.
- Jackson, J. R. Treas. Bot. 2:1255. 1876.