Anisophyllea disticha

 

Anisophyllea disticha
Anisophylleaceae
Cucurbitales

A tree (sapling here) with droopy branches and stalkless, alternately arranged leaves that are lance to diamond shape. Interesting that it can thrive in "full shade"?

Reference:
Anisophyllea disticha - National Parks Board (nparks.gov.sg)