Brachystelma R.B. (syn. Ceropegia) L. is a genus of over 100 species in the Apocynaceae Juss. family found in Africa, Asia and Australia with the majority found in South Africa. Plants are perennial with usually annual stems and fleshy roots, clustered or in a disc-like stem tuber or caudex. Tubers of many of the species are eaten by animals and people. Plants of the World Online and World Flora Online in 2023 are including this genus in Ceropegia, but you still see many references to it from South Africa and succulent websites under the previous name.
Brachystelma caffrum (Schltr.) N.E.Br., syn. of Ceropegia caffra (Schltr.) Bruyns, is found in the Eastern Cape, South Africa, growing in rock crevices on flat dolerite outcrops. It is rare and localised and listed as a threatened Red Data Species. Photo by Cameron McMaster
Brachystelma cathcartense R.A.Dyer, syn. Ceropegia cathcartensis (R.A.Dyer) Bruyns, is found in shallow soils in grassland where it is endemic to the Cathcart district of the Eastern Cape of South Africa. It has one or two cup shaped flowers that are maroon/black with a maroon center and green tips to the petals. It flowers in mid-summer. Pictures below from Cameron McMaster were taken in habitat in the Cathcart district and show the flower, tuber, and fruit.
Brachystelma meyerianum Schltr., syn. Ceropegia meyeriana (Schltr.) Bruyns, is found in the Eastern Cape, South Africa. It is a variable species, more widespread and also found in shallow soils on rocky outcrops. Photo by Cameron McMaster of two different colored flowers.