Shen Collection, Upper Volume Radical: Grass (cǎo) 葄 Kangxi Brush Strokes: 15 Page 1043, Entry 25 Pronounced zuo (falling tone). A water taro. Also, to cushion or support. From the History of the Tang Dynasty (Tangshu), biography of Li Kui: "Using books and histories as a cushion for one's pillow." Also pronounced zu (flat tone). Used interchangeably with the variant form (zu). According to the Encyclopedia of Classifications (Leipian), this refers to a type of grass, sometimes written in the variant form (zu).