Sphenostemon arfakensis Sphenostemon arfakensis (GIBBS) STEEN. & ERDTMAN in Svensk Bot. Tidskr. 49: 22. 1955≡Idenburgia arfakensis GIBBS, Fl. Phyt. Arfak: f. 11. 1917≡Nouhuysia arfakensis (GIBBS) STEEN. in Acta Bot. Neerl. 1: 97. 1952
