Paphiopedilum gratrixianum Masters ex Rolfe, 1905, Orchid Rev. 13: 63; Seidenf. 1992, Orch. Indochina: 17; Aver. 1994, Identif. Guide Vietnam. Orch.: 20; Aver. et Averyanova, 2003, Updated Checklist Orch. Viet.: 48; Aver. et al. 2003, Slipper Orch. Vietnam: 199. – Cypripedium gratrixianum Masters, 1905, Gard. Chron. Ser. 3, 37: 76, fig. 35, nom. inval., non B.C. Williams, 1897. – P. villosum (Lindl.) Stein var. gratrixianum (Masters ex Rolfe) Braem, 1988, Paphiopedilum: 119. Described from Laos (“Native of Annam”). Type (“Micholitz s.n., cult. Sander”)

– K.