This member of the Orchidaceae family was given this name by Leslie Andrew Garay & Peter Geoffrey Taylor in 1976. It is found in Kenya, Madagascar, Mozambique, South Africa and Zimbabwe, growing in a rich and well drained soil with quite some water water and some sun. The pseudobulbs grow to two and a half to three centimetres with 20 centimetre leaves. The 50-80 centimetre inflorescence have 9-20 flowers, yellow to greenish with purple or red nerves.
The genera name from Greek oikeios; 'special' or 'separate', and Greek klados; 'branch', probably for the short branches of the former Angraecum maculatum and the mottled leaves, according to Genaust, l.c. It was published by John Lindley in Edwards' Bot. Reg. 18: sub t. 1522. 1832. The species is named after Raymond Decary, 20th century plant collector.