This member of the Pedaliaceae family was given this name by Jean-Henri Humbert in 1962. It is found in southern Madagascar, growing in a well drained soil with quite some water and some to lots of sun. The stem starts out with a nice caudex, but ends up just slightly choppy stem of 30 centimetres in diameter. The little tree can grow to five or even eight metres height. The flowers are rather small for a Uncarina, bright yellow with a maroon to black throat. The genera is named for the Uncarina tribe of Madagascar. The species is named after Raymond Decary, 20th century plant collector. As with the other Uncarinas, cuttings do form a caudex.

