Oncidium mexicanum (L.O. Williams) M.W. Chase & N.H. Williams Oncidium mexicanum (L.O. Williams) M.W. Chase & N.H. Williams in Lindleyana 21(3): 25. 2008 sec. Villaseñor 2016≡Sigmatostalix mexicana L.O. Williams in Amer. Orchid Soc. Bull. 10: 239, f. 1. 1942 syn. sec. Solano Gómez & al. 2020