Alocasia odora (Lindl.) K. Koch

Pictures 1 & 2 in Taiwan, Fuxing to Qilan, Valley, 22 November 2013
(first picture with smaller leaves of Colocasia formosana)
Picture 3 in Taiwan, Wulu Valley, 30 November 2013
Picture 4 in China, South Yunnan, Xishuangbanna, June 1999