Scientific name: Rhynchospora rugosa (Vahl) Gale, 1944 (CCVN, 3:666)English name: Vietnamese name: Chuỷ tử nhám; Cói đầu hồng trung hoaOther name: Schoenusrugosus Vahl, 1798. - Rhynchospora chinensis Boeck, 1873 (FGI, 7:148);