This member of the Asclepiadaceae* family was described by Friedrich Richard Rudolf Schlechter in 1894. It is found in Eswatini, Kenya, Mozambiquea dn KwaZulu-Natal in South Africa, growing in a well drained soil with some water and some sun. The caudex might grow to twelve centimetres or more, the vines to two meters or more. The flowers are green.
The genera name from Greek rhaphis; 'beet-root' and akme; 'sharpness' possibly referring to the taste of the roots - haven't tried yet. The species name after Henry G. Flanagan, 1861-1919, a South African citrus farmer, interested in botany. *)Accordantly to the latest taxonomic system; APG IV 2016, Asclepiadaceae is now part of the Apocynaceae.

