Prunus costata (Hemsley) Kalkman in Blumea 13: 78. 1965
- ≡Pygeum costatum Hemsley in Kew Bull. 1898: 98. 1901
Mt Scratchley, Giulianetti (via McGregor) s.n. ()
- =Pygeum papuanum Hemsley in Kew Bull. 1898: 99. 1901
Mt Scratchley, Giulianetti (via McGregor) s.n. ()
- =Pygeum rigidum Koehne in Bot Jahrb. 52: 339. 1915
- =Pygeum retusum Merr. & Perry in J. Arnold Arbor. 21: 195. 1940
Lake Habbema, Brass & Meijer Drees 10428 (); Lake Habbema, Brass & Meijer Drees 10439 (); Holotype: Lake Habbema, Brass 9035 ()
- =Pygeum hagenianum Gilli in Ann. Naturhist. Mus. Wien 83: 455. 1980
Mt Hagen, Dosedla 145 (); Holotype: Mt Hagen, Dosedla 7295 ()
