Medicinal properties of Aloe vera, Stalked Bulbine etc

I volunteer for a charity called GardenAfrica, who note an increasing awareness that traditional medicine can play an important role in tackling the debilitating secondary infections associated with HIV.

The charity trains communities in Southern Africa to grow food primarily, but also plants which can be used as herbal medicine. In some rural areas clinics are scarce, so people turn to traditional healing methods.

What other plants can be grown in Southen Africa that have medicinal properties - especially in treating those symptoms of HIV?

http://www.gardenafrica.org.uk/garden_africa_success_story_isaac_xa...