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Computer-based aids have been used extensively to support surveys of threatened plants in Southern Africa. The surveys have shown that by far the highest concentration of threatened plants occurs in the relatively small area of the Cape Floristic Kingdom, a region with many local endemics that are easily put in hazard by impacts such as agriculture, invasive exotics and over-frequent fires. Of the estimated 20 000 vascular plants in Southern Africa, 2373 appear to be critically rare, threatened or recently extinct. Sixty-eight per cent of the plants in hazard occur in the Cape Floristic Kingdom. Obstacles to conservation, particularly a lack of nature reserves in critical areas, are discussed.