The top photos were taken on 17 Feb 10 and the bottom photos were taken on 19 Feb 10.
This is a most interesting native shrub from the Rubiaceae family that closely resembles the Ixora in terms of its flowers.
It flowered in Oct 09 and it flowered recently, presumably due to the prolonged dry spell. The fragrant flowers opened white but gradually turned yellow with time. The protruding pistils reminded me of arrows pointing in a single direction. The bark of the trunk is surprising magenta in colour and contrasts dramatically with the white and yellow flowers.
Frankly, how often do you find flowers of two colours on a single plant?