Four currently accepted species names in Apiaceae are changed because of illegitimacy or nomenclatural priority. Lomatocarpa korovinii Pimenov nom. illeg. should be replaced by Lomatocarpa alata (Korovin) Pimenov & Sennikov comb. nova, Pseudotrachydium vesiculoso-alatum (Rech. f.) Pimenov & Kljuykov is renamed to Pseudotrachydium kopetdaghense (Korovin) Pimenov & Sennikov comb. nova, Ferula feruloides Korovin nom. illeg. should be called Ferula paniculata Ledeb., and Oedibasis tamerlanii Korovin ex Nevski nom. illeg. is correctly named Oedibasis chaerophylloides (Regel & Schmalh.) Korovin. A complete list of synonyms for all four species is verified, their legitimate or illegitimate status is established, and nomenclatural types are indicated or (for Trachydium kopetdagense Korovin) designated here.