Shen Collection, Upper Volume Radical: Grass (cǎo) Suo; Kangxi strokes: 13; Page 1035, Entry 06 According to Tang Rhymes (Tangyun), Rhyme Collection (Yunhui), and Orthodox Rhymes (Zhengyun), this is the same as suo. In the Rites of Zhou (Zhouli), section on Officials of Heaven (Tianguan), under the role of the Field Master (Dianshi): During sacrifices, they provide xiao mao (a type of herb). Commentary: The character xiao is sometimes written as suo; the character suo is pronounced suo. Also in the Book of Odes (Shijing), section Lesser Odes (Xiaoya): There is wine to filter (xu) for me. The Commentary (Zhuan) states: xu has the same meaning as suo. The Annotations (Jian) explain: This refers to using grass to filter wine and remove the dregs. Also according to the Classified Chapters (Leipian), suo refers to the stopper for the mouth of a wine vessel. Also, according to Ancient Sounds of Tang Rhymes (Tangyun guyin), the suo in suo mao is also pronounced with the sound of xiao. Also according to the Collection of Rhymes (Jiyun), pronounced you. It refers to an aquatic grass. In the Erya, section on Explaining Grass (Shicao): suo is the same as manyu. Commentary: It grows in water. It is also called xuanyu, and in the Jiangdong region, it is called suo. Also pronounced you. The name of a grass.