Synonyms: Coprosmanthus nipponicus (homotypic); Coprosmanthus simadai; Smilax herbacea intermedia; Smilax herbacea nipponica; Smilax herbacea oblonga; Smilax herbacea var. higoensis; Smilax herbacea var. intermedia; Smilax herbacea var. nipponica (homotypic); Smilax herbacea var. oblonga; Smilax higoensis; Smilax longipedunculata; Smilax nipponica f. grandifolia; Smilax nipponica manshurica; Smilax nipponica var. angustifolia; Smilax nipponica var. higoensis; Smilax nipponica var. manshurica; Smilax oblonga; Smilax oldhamii f. angustifolia; Smilax oldhamii f. higoensis; Smilax oldhamii f. subtrifoliata; Smilax oldhamii f. tenuifolia; Smilax oldhamii var. higoensis; Smilax simadai