Three new combinations are proposed in two genera of Poaceae following the recent phylogenetic data: Cenchrus beckeroides (Leeke) Olshanskyi, comb. nov., Cenchrus exiguus (Mez) Olshanskyi, comb. nov., and Cenchrus ledermannii (Mez) Olshanskyi, comb. nov. Two replacement names are validated: Cenchrus hochstetteri Olshanskyi, nom. nov. (= Pennisetum humile Hochst. ex A. Rich), honoring Christian Ferdinand Friedrich Hochstetter, a German botanist, and Elymus ×irynae Olshanskyi, Shiyan & Antonenko, nom. nov. (= Elymus ×karakabinicus (Kotukhov) Olshanskyi, nom. illeg., ×Elymotrigia altaica Kotukhov), honoring Iryna Korotchenko, a Ukrainian botanist and conservationist.

Keywords: Cenchrus, ×Elymotrigia, Elymus, Elytrigia, hybrid, nothotaxon, Pennisetum, species

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