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.Skottsberg, Carl Johan Fredrik & Pilger, Robert Knud Friedrich. 1920. Repertorium Specierum Novarum Regni Vegetabilis 16: 385-386 descriptions in Latin, commentary in GermanMatthei, Oscar R. 1974. Boletín de la Sociedad de Biología de Concepción 48: 171, f. 1a, c–e in SpanishSteudel, Ernst Gottlieb von. 1854. Synopsis Plantarum Glumacearum 1: 237 in LatinGrassbase - The World Online Grass Flora It contains a single species, Megalachne berteroniana.
A genetic analysis found it to be most closely related to the extinct Podophorus, also endemic to the Juan Fernández archipelago. This clade was in turn found to be nested within a paraphyletic Festuca, most closely related to F. pampeana of South America.
Several species formerly included in genus Megalachne are now considered synonyms of species placed in other genera: Megalachne dantonii – synonym of Festuca dolichathera Megalachne masafuerana (Skottsb. & Pilg.) Matthei – synonym of Festuca masafuerana Megalachne robinsoniana – synonym of Festuca robinsoniana Megalachne zeylanica - synonym of Eriachne triseta
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