Shen Collection, Upper Volume Radical: Grass (cǎo) Entry: 蕅 Kangxi stroke count: 18 Page 1057, Entry 02 Tang Dynasty Rhyme Dictionary (Tangyun), Jade Chapters (Yupian): Same as the character for lotus root. Explaining Graphs and Analyzing Characters (Shuowen): Zhang Chao states that this is the correct character for water caltrop and lotus root, which is erroneously written as lotus root in common usage. It is also written in a variant form.