Alocasia odorum (G.Lodd.) Spac

Family: Araceae
English: Elephant Ear
Japanese: キリシマテンナンショウ [Kirishima Tennanshō]

Where I grew up we called these elegant garden plants Elephant Ears, and we were warned never to eat them. Apparently the cells contain oxalix acid, a microscopic, hook-like abrasive that can cause your throat to swell up so badly people are sometimes taken to the hospital...ugh! While it is fun to take shelter from the rain under the leaves, I have heard that too much handling can cause an unpleasant reaction.

References:
九州野山の花 片野田逸朗,2004：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13日