For quite a long time, I had thought that this herb was Solanum nigrum (another Black Nightshade). After I started to grow it and did a more detailed search on information related to this herb, its identity appeared to be the American Black Nightshade (Solanum americanum). However, I came across a genetic study by Manoko  that made me deduced that the species seen in Singapore is more likely to be Solanum nodiflorum although some botanists treat Solanum americanum and Solanum nodiflorum as the one species (i.e. Solanum americanum). According to the publication, besides the genetic evidence, the flower of Solanum americanum has an exserted style (pillar-like stalk that connect to the ovary) while this feature is not presence in Solanum nodiflorum. The plant that I saw did not had an exserted style. With this information, I had decided to move the name of my pictures to Solanum nodiflorum.
 Manoko M. L. K., van den Berg R. G., Feron R. M. C., van der Weerden G. M., and Mariani C. (2007) AFLP markers support separation of Solanum nodiflorum from Solanum americanum sensu stricto (Solanaceae). Plant Systematics & Evolution. 267: 1-11.
I managed to collect some fruits from the wild in October 2012 and grow a few of the plants at home. The pictures below showed the fruits and seed collected as well as the home-grown plants. | MORE |