Photo by Hildor Hoffmann.
This member of the
Asclepiadaceae* family was described by Eileen Adelaide
Bruce in 1937.
It is found in Tanzania,
growing in a well drained soil with some water and lots of sun. The
caudex can grow up to 15 centimetres in diameter, the stem to 20
centimetres height. The flowers are green and purple.
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 for the long tubes of the flowers.
*)Accordantly to the latest taxonomic system; APG IV 2016, Asclepiadaceae is now part of the Apocynaceae.