Shen Collection, Upper Volume Radical: Grass (cǎo) 薣 Kangxi strokes: 19 Page 1061, Entry 39 Compendium of Phonology (Jiyun): Pronounced gu (rising tone). Name of a plant. Erya (Erya): In the interpretation of grasses, red knotweed is called longgu. Commentary: Red knotweed is also known as longgu. Originally written as gu, commonly written as 薣.