IXORA CONGESTA

I think this is the Ixora congesta from the Rubiaceae Family but the flowers have yet to open.

A few interesting links are shown below. The one from Top Tropicals show a double-petaled variety whilst the one from Thailand shows a key to identify the plants.

1. http://www.wildsingapore.com/wildfacts/plants/others/ixora/congesta.htm
2. http://toptropicals.com/cgi-bin/garden_catalog/cat.cgi?uid=Ixora_congesta
3. http://homepage.univie.ac.at/christian.puff/FTH-RUB/FTH-RUB_CULTIVATED_compl_WEB.htm#ixcon