Abstract
Through field observations, we concluded that Cayratia tenuifolia (Wight & Arn.) Gagnep. is distinct from C. japonica (Thunb.) Gagnep., although it is sometimes treated as a synonym of C. japonica. The floral disk of C. tenuifolia is yellow at anthesis and white after anthesis and the mature fruits are depressed obpyriform. In C. japonica the disk is orange at anthesis and becomes pink after anthesis and the fruits are globular. The chromosome number of C. tenuifolia is 2n=40.
