Deiregyne falcata (L.O. Williams) Garay in Bot. Mus. Leafl. 28(4): 312. 1982 sec. Soto-Arenas & al. 2007
- ≡Spiranthes falcata L.O. Williams in Bot. Mus. Leafl. 12(7): 228, t. 32. 1946 syn. sec. Soto-Arenas & al. 2007
- =Schiedeella falcata (L.O. Williams) Burns-Bal. in Orquídea (Mexico City) n.s. 8(1): 39. 1981 syn. sec. Soto-Arenas & al. 2007
- =Oestlundorchis falcata (L.O. Williams) Szlach. in Fragm. Florist. Geobot. 36(1): 30. 1991 syn. sec. Soto-Arenas & al. 2007
- =Oestlundorchis falcata subsp. velatoides Szlach. in Fragm. Florist. Geobot. 36(1): 30, f. 3. 1991 syn. sec. Soto-Arenas & al. 2007