Wu Collection, Lower Volume. Radical: Grain (hé). Kangxi strokes: 16. Page 859, Entry 18.
According to the Collection of Rhymes (Yunhui), this is the same as the character pronounced zhi. For full details, see the entry for the character pronounced zhi.
Supplement to the Collection of Rhymes (Yunhui bu) notes that the characters pronounced xi and the characters pronounced xi are different. The Collection of Rhymes uses the form with the grain radical, perhaps because the character pronounced chi can be synonymous with the character pronounced chi. However, one should follow the Explaining Graphs and Analyzing Characters (Shuowen jiezi) and the Collection of Rhymes (Jiyun) in regarding the form with the grain radical as the correct version.
Additionally, according to the Five Sounds Collection of Rhymes (Wuyin jiyun), it is pronounced ti. It is the same as the character pronounced qi.