Fragrant Ixora is native to Madagascar where it is found in humid forests.
It is widely cultivated in tropical regions worldwide and was introduced into Hawaii in 1935. The genus Ixora contains approximately 300 species with a pantropical distribution and a center of diversity in Southeast Asia and Oceania. Madagascar has 35 Ixora species all of which are endemic.
(De Block, P. J. Tosh, A. Mouly, and S. Dessein. 2007. The diversity of Madagascan Ixoras revealed, with comments on their origin and their radiation on the island. Oral presentation to the 17 AETFAT Congress, 26 February-2 March, 2007 in Yaounde, Cameroon.)
(Staples, G. W. and D. R. Herbst. 2005. A Tropical Garden Flora: Plants cultivated in the Hawaiian Islands and other tropical places. Bishop Museum Press, Honolulu, Hawai’i.)
(Stevens, P. F. (2001+). Angiosperm Phylogeny Website. Version 7, May 2006 [updated 05/28/2007]. http://www.mobot.org/MOBOT/research/APweb/.)