By mere chance, I actually grew 2 of this plant in a pot which eventually flowers and produce 2 seeds. The seeds of the 2 plants came buried in the soil that I obtained from a nursery. The identity of the plant was only reveal to me when I saw its fruits. Below is the pictorial history of the 2 plants.
The birth of the "unknown" plants in October 2009:
Progressive growth of the 2 plants over the next 2 months:
In January 2010, the plants were moved to a larger pot. They adapted quite well to the new home:
In July / August 2010, they had grown to a small shrub with many leaves:
The flower buds started to appear in September 2010, about one-year old:
Finally, in March 2011, I got the first and only 2 fruits. This was the time that I eventually confirmed the identity of this "unknown" plant:
The plants eventually died but I could not recall when it happened --- likely in the second half of 2011. In July 2013, someone checked with me on the availability of this plant in Singapore. I then realized that I still had the 2 dried fruits with me, kept in a sealed container.