The leaves of your tree remind me of something we saw this summer here
Most likely a singapore cherry...
a misnomer, since its native to central america like countries of
Panama or even mexico...
botanical name :*Muntingia calabura
Arijit Banerji showed it flowers in June this year from Kolkata:
Wikipedia has many pics by our own gargji: http://en.wikipedia.org/wiki/Muntingia
Grows all over India in disturbed lands and sometimes becomes big
I have only seen thin young trunks...
Lets see what the experts say...
ps if you had even one flower pic , it would have been diagnostic...