Thanks, I will follow your suggestion. This was also one of my candidates... but I am a specialist of trees/plants. I would need this information for my upcoming talk about forests and biodiversity of Taiwan.
I would say it is Buergeria japonica or Buergeria robusta. Can you give a bit more information of where you found it? What altitude? Do you have any other photos?
And some further site information: picture taken on 31.07. 2013 in Tianxiang (center of the Taroko National Park), N24°10’50.3’’ E121°29’36.8’’, 475 m a.s.l.