Are there any more clues for identification? Can you please post some photos with helpfull details?

Please tell flower and fruit characters and send some photos.

Your description doesn't help to the identification.

The photo is needed absolutely.

Thanks

This is a medium-sized tree species with very large lanceolate leaves (size: @ 30 cm broad x 150 cm long). I feel this plant may belong to the plant family Dilleniaceae/Clusiaceae but am unable to identify the scientific name of the plant. Can anyone identify systematic name of this plant?

To me it looks like Dillenia reticulata or D. grandifolia. They are described and compared on:

http://florasingapura.com/Dillenia_reticulata.php

http://florasingapura.com/Dillenia_grandifolia.php

Kindly post the clear picture with a flower

Same with Germaine Cornet, I think it is Dillenia