This member of the Apocynaceae family was described by John Gilbert Baker in 1886. It is found on Madagascar, growing in a well drained soil with some water and some sun. The stem will grow up from 30 to 200 centimetres in diameter and reach a height of 90 centimetres. The flowers are yellow.
The genera name from Greek; pachys; 'thick' and Greek podion; 'small foot' for the thick caudiciform trunk, formed by some species. The species name means 'densely flowered'. Not the ones I have seen....

