This member of the Asclepiadaceae* family was given this name by Nicholas Edward Brown in 1895. It is found in Angola and Tanzania, growing in girth or other well drained soil with some water and lots of sun. The caudex can grow to 20 centimetres in diameter. The stem to 60 centimetres height. The flowers are greenish and red-brown.
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 as it was found in Angola. *)Accordantly to the latest taxonomic system; APG IV 2016, Asclepiadaceae is now part of the Apocynaceae.

