Hi John
As far as I know Dr Brian Molloy is still working on this. Quite a bit has been done on the complex with respect to their cytology and DNA sequence data has been gathered (see Mitchell et al 2009) but beyond that its a "work in progress".
Cheerio
Peter
Mitchell, A.D.; Heenan, P.B.; Murray, B.G.; Molloy, B,.P.J.; de Lange, P.J. 2009: Evolution of the south-west Pacific genus Melicytus (Violaceae): evidence from DNA sequence data, cytology, and sex expression. Australian Systematic Botany 22: 143-157.