Seen on the Hellhole Canyon Trail to Maidenhair Falls.
Very common with many seedlings in understorey of mixed broadleaved podocarp forest
This tree has a very big fruit/seed that falls onto the ground (it's diameter is about 7cm), as seen on the third picture. It's flower is white.
Apocynaceae is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly called the dogbane family. Members of the family are native to European, Asian, African, Australian and American tropics or subtropics, with some temperate members.