This member of the Apocynaceae family was given this name by
Nicholas Edward Brown & Otto Stapf in 1908. It is found
in Angola, Cameroon, Malawi, Za´re and Zimbabwe, growing in a well drained
bur rather rich soil with
some water and lots of sun. The caudex can grow to fifteen
centimetres in diameter, the entire plant to ten centimetres in
flowers are purple.
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 means 'useful' as it can be eaten.
*)Accordantly to the latest taxonomic system; APG IV 2016, Asclepiadaceae is now part of the Apocynaceae.