The taxonomic relation between Oenothera royfraseri and O. turoviensis (sect. Oenothera, subsect. Oenothera; Onagraceae) has remained unresolved. According to the representatives of the so-called American school of taxonomy (W. Dietrich, P.H. Raven, W.L. Wagner) the former name is one of almost 70 synonyms of widely treated O. biennis (AB-II plastome-genome combination) while the latter is a synonym of O. parviflora (BC-IV arrangement). On the other hand, European researchers (K. Rostański, A. Soldano, V. Jehlík) tend to assign both names to one species, under the name O. royfraseri. In order to establish the taxonomic relation of the studied taxa, morphometric comparisons, based on qualitative and quantitative traits, were carried out. The studies included European specimens labelled as O. royfraseri and/or O. turoviensis (with the nomenclatural types of the two names) as well as representatives of the two other species, O. biennis and O. parviflora, which were taken as a background. The performed multivariate statistical analyses (correspondence analysis, principal component analysis, discriminant analysis followed by canonical discriminant analysis) provided strong evidence supporting the American’s hypothesis on separateness of the two species. As it was demonstrated, O. royfraseri and O. turoviensis differ mostly by the sepal tips arrangement, which is considered by American and European researchers as one of the most essential variables in taxa recognition within the group. The obtained results have also indicated that O. royfraseri is distinct from European representatives of O. biennis, which is partially concordant with Rostański’s opinion. The two last-mentioned species can be discriminated by red vs. green papillae, strigillose vs. glandular hair predominance, respectively, as well as by quantitative features of the flowers, which are significantly larger in O. biennis.

Pliszko A., Woźniak-Chodacka M., 2019: New records of vascular plant distribution in the Polish part of the Lithuanian Lakeland, north-eastern Poland. -Botanica, 25(1): 97-101. The paper presents new localities of 15 vascular plants recorded in the Polish part of the Lithuanian Lakeland, north-eastern Poland in 2017-2018, using the ATPOL cartogram method. Crepis capillaris, Diplotaxis tenuifolia, Eragrostis albensis, Matthiola longipetala, Oenothera fruticosa, Oenothera glazioviana and Rubus armeniacus are listed as new species for the regional flora. NAUJOS INDUOČIŲ AUGALŲ RADAVIETĖS SŪDUVOS AUKŠTUMOJE, ŠIAURĖS RYTŲ LENKIJOJE Artur PLISZKO, Monika WOŹNIAK-CHODACKA Santrauka Straipsnyje pateikiamos naujos 15 induočių augalų radavietės, nustatytos Sūduvos aukštumoje, šiaurės rytų Lenkijos dalyje, 2017-2018 m. Radimo vietos buvo kartografuotos naudojant ATPOL metodą. Crepis capillaris, Diplotaxis tenuifolia, Eragrostis albensis, Matthiola longipetala, Oenothera fruticosa, Oenothera glazioviana ir Rubus armeniacus yra naujos regioninės floros rūšys.

Oenothera Linnaeus (1753: 346) (Onagraceae) is indigenous to North America (Dietrich et al. 1997), where the great diversity of the genus is reflected by its division into 18 sections and several subsections and series (Wagner et al. 2007). At different times and circumstances, particular evening-primrose species have naturalized in other parts of the world—currently they are known from nearly all continents: North and South America, Asia, Australia, Africa and Europe as well (Cleland 1972, Dietrich et al. 1997, Rostański et al. 2004). Reaching new lands, they began to spread and hybridize with each other, which might have resulted in the origin of new species, unknown from the native area (Dietrich et al. 1997).