The current taxonomic status and nomenclature of nine taxonomically problematic species of vascular plants listed in the 3rd edition of the Red Data Book of Ukraine are analyzed based on recent phylogenetic and taxonomic literature and other relevant evidence. For some species, taxonomic and nomenclatural changes are unavoidable and new names should be accepted in the new edition of the Red Data Book of Ukraine. Nomenclatural citations and literature references are provided, as well as discussion and justification for the name changes. The following names are accepted and discussed in detail: Paragymnopteris marantae (L.) K.H. Shing (= Notholaena marantae (L.) Desv.), Colchicum versicolor Ker. Gawl. (= Bulbocodium versicolor (Ker. Gawl.) Spreng.), Gagea serotina (L.) Ker. Gawl. (= Lloydia serotina (L.) Rchb.), Rhaponticoides taliewii (Kleopow) M.V. Agab. & Greuter (= Centaurea taliewii Kleopow), Kalmia procumbens (L.) Gift, Kron & P.F. Stevens ex Galasso, Banfi & F. Conti (= Loiseleuria procumbens (L.) Desv.), Clinopodium serpyllifolium (M. Bieb.) Kuntze (= Micromeria serpyllifolia (M. Bieb.) Boiss.), Phlomoides scythica (Klokov & Des.-Shost.) Czer. (= Phlomis scythica Klokov & Des.-Shost.), and Torminalis clusii M. Roem. ex K.R. Robertson & J.B. Phipps (= Sorbus torminalis (L.) Crantz). The validity of the name Crocus tauricus (Trautv.) Puring is confirmed.
Keywords: taxonomy, nomenclature, vascular plants, Red Data Book of Ukraine, Paragymnopteris, Colchicum, Crocus, Gagea, Rhaponticoides, Kalmia, Clinopodium, Phlomoides, Torminalis
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