The systematics of Ixora at generic level is quite well understood, but the delimitation
of species is not. Thus there have been both confusion and superfluity in nomenclature.
The most recent accounts of the genus are those of Bremekamp (1937b) and Corner (1941),
the latter dealing with Malayan taxa. Thus there is no modern guidance to identification for
Ixora species. The Rubiaceae is one of the largest families not yet treated for the Flora of
Thailand, and Ixora represents one of the most problematic genera of the family, with the
limits of many species needing to be clarified.