This member of the Euphorbiaceae family was described by Isaac Bayley Balfour in 1884. It is found on Socotra, growing in grit or other well drained soil with little to some water and lots of sun. The central stem can grow to 18 centimetres in diameter, and two metres in height. The flowers are from pale yellow to yellow.
The genera name from the Greek words ἰατρός; iatros, meaning 'physician', and τροφή; trophe meaning 'nutrition', as to medicinal uses. The species name means 'one rib'. Typical flowers. Photo by Alain Christophe. The new leaves. Photo by Alain Christophe.

