Megalachne is a genus of Chilean plants in the grass family, found only on the Juan Fernández Islands in the Pacific Ocean, part of the Republic of Chile. Species 1. \n* Megalachne berteroniana Steud. 2. \n* Megalachne masafuerana (Pilg.) Mattheiformerly included see Eriachne \n* Megalachne zeylanica - syn of Eriachne triseta