Thanks Dr. Neil. Your posts with detailed pictures are very helpful.
I opted the name W. pubescens because
Flora of China treats this and W. arborea seperately. The latter species is characterized by the fruits with prominent lenticells (white dots on the surface!) which are obvious in the pictures of (fresh) fruits posted by you. I could not see such lenticells from the pictures posted by Chitra ji here.
But, I think you are correct by calling the posted plant as W. arborea due to the probable size of the fruits, which are seemingly narrower in W. pubescens.
Chitra ji, the dried and dehisced fruits (of the previous year) are seen just above the fingers in the 2nd picture.