Marlene . I grew a white Mussaenda about 15 years ago .I purchased it from . LIMBERLOST NURSERIES CAIRNS They will answer email so ask them .limberlost@bigpond.net.au
The only one I have now is Mussaenda philippica"luz"cost $11.95
The flowers are yellow and have dropped of
=========================
http://mgonline.com/mussaenda.html
http://www.jaycjayc.com/mussaenda-philippica-aurorae/
http://www.flowersofindia.net/catalog/slides/Mussaenda%20white.html
Hope that is of some help