Rubus grayanus Maxim.

Family: Rosaceae
Japanese: リュウキュウ（キ）イチゴ (琉球苺) [Ryūkyū (Ki) Ichigo]

One of the rasberry species on Yakushima that bares golden fruit. The leaves are said to be completely green; however, perhaps they have hybridized with local species so that they sometimes take on red undertones

References:
新版　屋久島の植物 川原勝征,初島住彦(監修),2001：南方新社
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14日）