This member of the Apocynaceae family was given this name by Robert Everard Woodson in 1933. It is found in Bolivia, Brazil and Paraguay, growing in sand or another well drained soil with some water and lots of sun. The caudex can grow to five centimetres, the single, annual stem up to 40 centimetres. The flowers are from dark pink to magenta. The genera is named after H. John Mandeville, 1773-1861, an English diplomat in Argentina. The species name means 'brilliant' or 'lustrous'. for the flowers.

