Garg ji,
The tree is in Theosophical society campus, Adyar Chennai.  
I am sure the Id suggested by me is correct.  As  this tree  has been planted / introduced  ( an isolated case)  the POWO  cannot   recognise  its  distribution .   This international  campus has many  exotic trees / plants planted by foreign  visitors from various countries.  This tree,  also, has been planted by a foreign visitor  decades back. 
Furthermore, the tree has been recorded by  one of the distinguished taxonomists of Chennai as S.apetala,  located in Theosophical society. 
For your kind information.