Farfugium hiberniflorum (Makino) Kitam.

Family: Asteraceae
English: Silverleaf or leopard plant (sp)
Japanese: カンツワブキ [Kantsuwabuki]

Splots of yellow as fall fades on sunny rocky outcrops at low to lower-middle elevations. Some people say there is also another species, ヤクシマツワブキ, but, according to https://sites.google.com/site/onodajp/research/yakushima/flora , this is probably a hybrid.

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
Molecular phylogeny and habitat diversification of the genus Farfugium (Asteraceae) based on nuclear rDNA and plastid DNA Plant Hunting in Yakushima http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2924832/
小野田雄介 屋久島の維管束植物 https://sites.google.com/site/onodajp/research/yakushima/flora (Aug 13, 2019)