Xyris fallax Malme in Bih. Kongl. Svenska Vetenskapsakad. Handl. no. 2: pl. I, f. 5. 1896 sec. Charles N. Horn & al. 1994
- =Xyris dolichosperma Lanjouw in Recueil Trav. Bot. Neerl. 34: f. 5. 1937
- Holotype: Suriname, near Zanderij I, Pulle 39
- =Xyris erythema Maguire & L.B. Smith in Mem. New York Bot. Gard. 10: fig. 1 A-F. 1964
- Holotype: Guyana, Mt. Ayanganna, E flank above Thompson Camp, S.S. & C.L. Tillett & Boyan 45074
- Isotype: Guyana, Mt. Ayanganna, E flank above Thompson Camp, S.S. & C.L. Tillett & Boyan 45074
