In Greek mythology, Elymus (or Elumos) was the mythical ancestor of the Elymians, natives of Sicily. Elymus was a Trojan, a natural son of Anchises and a brother of Eryx. (Tzetz. ad Lycopli. 959.) Previous to the emigration of Aeneas, Elymus and Acestes had fled from Troy to Sicily, and had settled on the banks of the river Crimisus, in the country of the Sicani. When afterwards Aeneias also arrived there, he built for them the towns of Segesta and Elyme, and the Trojans who settled in that part of Sicily called themselves Elymi, after Elymus. (Dionys. Hal. A. R. i. 52, &c.) Strabo (xiii. p. 608) calls him Elymnus, and says that he went to Sicily with Aeneias, and that they together took possession of Eryx and Lilybaeum. Elymus was further believed to have founded Asca and Entella in Sicily. (Virg. Aen. v. 73, with Servius's note.)
In botany, Elymus is the genus of the wild rye.