Shen Collection, Upper Volume Radical: Grass (cǎo) 藗 Kangxi strokes: 21 Page 1065, Entry 16 Pronounced su Shuowen Jiezi (Shuowen): Male thatch grass. Erya (Erya), Interpretation of Grasses: The su is a male thatch grass. Commentary: A variety of white cogon grass. Commonly written as the variant form (su).