Following our recent lectotypification (with a specimen from G-DC) of the name Senecio praealtus Bertol. var. borysthenicus DC. validated by de Candolle based on Andrzejowski's and Besser's specimens from Ukraine, we provide here information on additional original specimens of that taxon (KW: Besser and Turczaninow historical collections), which is now recognized as Jacobaea borysthenica (DC.) B. Nord. & Greuter and which was until recently widely accepted as Senecio borysthenicus (DC.) Andrz. ex Czern. (Asteraceae). In particular, there are two isolectotypes in KW collected by Andrzejowski near Kyslyakivka (now Lymany, Mykolayiv Region, Ukraine), as well as some other specimens collected near Zaporizhzhya (Andrzejowski) and in southern Podolia (Besser and/or Andrzejowski). Some related Eastern European taxa of the taxonomically complicated Jacobaea vulgaris Gaertn. (= Senecio jacobaea L.) aggregate and misapplied names are discussed as well. The identity of the name Senecio divaricatus Andrz. (nom. illeg., non L.) is clarified; it is a synonym of Jacobaea borysthenica. It is also confirmed that Senecio podolianus Panigrahi is an illegitimate replacement name for S. borysthenicus. Jacobaea borysthenica seems to be closely related to J. andrzejowskyi (Tzvelev) B. Nord. & Greuter and J. vulgaris subsp. pannonica Hodálová & Mered'a; the two latter taxa morphologically differ from J. borysthenica but are very similar to each other and may be even conspecific. Further studies are needed for clarifying the complex evolutionary and biogeographical patterns within the J. vulgaris aggregate in Eastern Europe and adjacent areas.

Supplementary Material. Electronic Supplement (Figures E1–E4, e1–e4) is available in the online version of this article below

Keywords: Asteraceae, herbarium, Jacobaea, nomenclature, Senecio, taxonomy, Ukraine

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