Young plants found in the Nature Reserve.
The basal modified leaflets clasping the stem is known as leaf domatia. Ants nest under these leaf domatia. Hence, it is also known as an ant-plant. 
Based on an article on Pometia published in 1962 , Pometia pinnata has at least 8 forms. In October 2012, I obtained the fruits below from a local fruit stall. The fruits stall were labelled in Chinese as "Brazil Longan". Its shell was much thicker and harder than Longan (Dimocarpus longan). The flesh is slightly yellowish, firmer and less sweet compared to Longan. At the end of the search via the Internet, I ended up with its identity as the fruit of this tree. It is likely to be from another form of Pometia pinnata as the fruit from Pometia pinnata forma glabra (above) is more elongated.
 Moog J, Atzinger K, Hashim R, Maschwitz U. Do tenants always pay their rent? The Asian ant-plant Pometia pinnata (Sapindaceae) and its leaf domatia provide free access to generalist ants. Asian Myrmecology 2008;2:17-32. | Read article |
 Jacobs M. Pometia (Sapindaceae), a study in variability. Reinwardtia 1962;6:109-144. | Read article |