The genus was first described in 1786 by
Jean-Baptiste Lamarck in
Encyclopédie Méthodique: Botanique. The publication includes descriptions of the species
Cossinia pinnata and
C. triphylla, named earlier by
Philibert Commerson. In 1982 Australian botanist Sally T. Reynolds formally described the new species name
Cossinia australiana, recognised that
C. triphylla is a synonym of
C. pinnata and updated
Ludwig A. T. Radlkofer's species identification key to include all four currently accepted species. ==Species==