Viburnum furcatum Blume ex Maxim.

Family: Adoxaceae
English: Scarlet-Leaved Viburnum
Japanese: オオカメノキ [Ohkaménoki]

The Japanese name is a reference to the resemblance of the leaves to turtle shells. The white false-flowers are particularly beautiful and look like little paper cut-outs when they fall. I also love the deep reddish undertones the new leaves sometimes have in spring.

References:
屋久島の植物　 川原勝征,初島住彦(監修),1995：八重岳書房
米倉浩司・梶田忠 (2003-)　「BG Plants 和名－学名インデックス」（YList），http://ylist.info（ 2019年8月13日）