The article contains data about interspecific hybrids of Eudicots recorded in Kharkiv Region, Ukraine. Totally, 25 hybrids of Eudicots were registered, described, and illustrated. An annotated list includes data about their distribution, ecological preferences, morphology, and information about the discovered localities. The article includes data of our own field survey, analyses of open databases on biodiversity, literature, and revision of the herbarium collections of the National Herbarium of Ukraine (KW) and V.N. Karazin Kharkiv National University (CWU). During field research, we discovered seven hybrids recorded in Ukraine for the first time (Arctium × neumanii, Centaurea diffusa × C. jacea, C. jacea × C. nigrescens subsp. pinnatifida, C. nigrescens subsp. pinnatifida × C. phrygia subsp. pseudophrygia, Corydalis × hausmanii, Rubus × areschougii, and Verbascum × thapsi) and six hybrids are new to Kharkiv Region (Arctium × cimbricum, Betula × aurata, Salix × reichardtii, Verbascum × brockmuellerii, V. × pseudolychnitis, Utricularia × neglecta). Some hybrids originated with participation of alien species or subspecies were registered (Centaurea diffusa and C. nigrescens subsp. pinnatifida). Besides, the article discusses the potential records of other hybrid Eudicots in the flora of Kharkiv Region in the future.

Supplementary Material. Supplementary Material S1 (Figs S1–S13) is available on this website: ukrbotj82-04-345-S1.pdf (7,443 KB).

Keywords: alien species, biodiversity, chorology, ecology, hybridization, morphology, new species records

Full text: PDF (Eng) 6.66M

1. Ainouche M.L., Baumel A., Salmon A., Yannic G. 2004. Hybridization, polyploidy and speciation in Spartina (Poaceae). New Phytologist, 161: 165–172. https://doi.org/10.1046/j.1469-8137.2003.00926.x
2. Bánki O., Roskov Y., Döring M., Ower G., Hernández Robles D.R., Plata Corredor C.A., Stjernegaard Jeppesen T., Örn A., Pape T., Hobern D., Garnett S., Little H., DeWalt R.E., Miller J., Orrell T., Aalbu R., Abbott J., Aedo C., Aescht E. et al. 2025. Catalogue of Life (Version 2025-07-10). Catalogue of Life Foundation, Amsterdam, Netherlands. https://doi.org/10.48580/dgrrq
3. Belyaeva I. 2009. Nomenclature of Salix fragilis L. and a new species, S. euxina (Salicaceae). Taxon, 58(4): 1344–1348. https://doi.org/10.1002/tax.584021
4. Bezsmertna O.O., Peregrym M.M., Vasheka O.V. 2012. Genus Asplenium L. (Aspleniaceae) in the natural flora of Ukraine. Ukrainian Botanical Journal, 69(4): 544–558.
5. Bobrov A.A., Volkova P.A., Kopylov-Guskov Yu.O., Mochalova O.M., Kravchuk A.E., Nekrasova D.M. 2022. Unknown sides of Utricularia (Lentibulariaceae) diversity in East Europe and North Asia or how hybridization explained old taxonomical puzzles. Perspectives in Plant Ecology, Evolution and Systematics, 54: 125649. https://doi.org/10.1016/j.ppees.2021.125649
6. Bondarenko H.M., Gamulya Yu.G. 2025. Centaurea nigrescens (Asteraceae) in the flora of Ukraine: history of research and new data. Chornomorski Botanical Journal, 21(1): 82–93. https://doi.org/10.32999/ksu1990-553X/2025-21-1-6
7. Bleeker W., Schmitz U., Ristow M. 2007. Interspecific hybridisation between alien and native plant species in Germany and its consequences for native biodiversity. Biological Conservation, 137(2): 248–253. https://doi.org/10.1016/j.biocon.2007.02.004
8. Buhk C., Thielsch A. 2015. Hybridisation boosts the invasion of an alien species complex: Insights into future invasiveness. Perspectives in Plant Ecology, Evolution and Systematics, 17(4): 274–283. https://doi.org/10.1016/j.ppees.2015.05.001
9. Cayouette J., Catling P.M. 1992. Hybridization in the genus Carex with special reference to North America. Botanical Review, 58: 351–438. https://doi.org/10.1007/BF02858773
10. Chervona knyha Ukrayiny. Roslynnyi svit (Red Data Book of Ukraine. Plant Kingdom). 2009. Ed. Ya.P. Didukh. Kyiv: Globalconsulting, 912 pp.
11. Czerniajev B.M. [Czerniaёw B.M.] 1859. Conspectus plantarum circa Charkoviam et in Ucraina sponta crescentium. Charkow: Typografia Universitas, 90 pp.
12. Davydov D.A., Gomlya L.M. 2021. Vascular plants of Poltava town territorial commune: an annotated checklist. Biology & Ecology, 7(1): 70–81. https://doi.org/10.33989/2021.7.1.243453
13. Edger P.P., Soltis D.E., Yochioka Sh., Vallejo-Marin M., Shimizu-Inatsugi R., Shimizu K.K., Salmon A., Hiscock S., Ainouche M., Soltis P.S. 2025. Natural neopolyploids: a stimulus for novel research. New Phytologist, 246(1): 78–93. https://doi.org/10.1111/nph.20437
14. Euro+Med PlantBase. 2005–onward. The information resource for Euro-Mediterranean plant diversity. Available at: https://www.emplantbase.org/home.html (Accessed 13 December 2024).
15. Fedoronchuk M.M. 2022a. Ukrainian flora checklist. 1: family Lamiaceae (Lamiales, Angiosperms). Chornomorski Botanical Journal, 18(1): 5–27. https://doi.org/10.32999/ksu1990-553X/2022-18-1-1
16. Fedoronchuk M.M. 2022b. Ukrainian flora checklist. 4: family Rosaceae (Rosales, Angiosperms). Chornomorski Botanical Journal, 18(4): 305–349 https://doi.org/10.32999/ksu1990-553X/2022-18-4-1
17. Fedoronchuk M.M. 2023a. Ukrainian flora checklist. 6: family Crassulaceae, Grossulariaceae, Haloragaceae, Saxifragaceae (Saxifragales, Angiosperms), and Convolvulaceae (incl. Cuscutaceae), Solanaceae (Solanales, Angiosperms). Chornomorski Botanical Journal, 19(2): 141–168. https://doi.org/10.32999/ksu1990-553X/2023-19-2-1
18. Fedoronchuk M.M. 2023b. Ukrainian flora checklist. 7: family Caprifoliaceae s. l. (incl. Dipsacaceae, Linnaeaceae, Valerianaceae), Viburnaceae s. l. (incl. Adoxaceae, Sambucaceae) (Dipsacales, Angiosperms), and Lythraceae (incl. Punicaceae, Trapaceae), Onagraceae, Myrtaceae (Myrtales, Angiosperms). Chornomorski Botanical Journal, 19(3): 243–271. https://doi.org/10.32999/ksu1990-553X/2023-19-3-1
19. Fedoronchuk M.M. 2024. Ukrainian flora checklist. 9: families Cistaceae, Malvaceae (incl. Tiliaceae) and Thymelaeaceae (Malvales, Angiosperms). Chornomorski Botanical Journal, 20(1): 5–18. https://doi.org/10.32999/ksu1990-553X/2024-20-1
20. Feliner G.N., Criado Ruiz D.C., Álvarez I., Villa-Machío I. 2023. The puzzle of plant hybridisation: a high propensity to hybridise but few hybrid zones reported. Heredity, 131(5): 307–315. https://doi.org/10.1038/s41437-023-00654-1
21. Fodor S.S. 1974. Flora Zakarpattia. Lviv: Vyshcha Shkola, 208 pp.
22. Flora URSR (Flora RSS Ucrainicae). 1938–1965. Vols 1–12. Kyiv: Publisher of the Academy of Sciences of Ukrainian SSR.
23. GBIF. 2025–onward. The Global Biodiversity Information Facility. Available from: https://www.gbif.org (Accessed 24 February 2025).
24. Gorelova L.N., Alyokhin A.A. 2002. Rastitel’ny pokrov Kharkovshchiny: Ocherk rastitel’nosti, voprosy okhrany, annotirovannyi spisok sosudistykh rasteniy. Kharkov: Publisher of V.N. Karazin Kharkiv National University, 231 pp.
25. Hodálová I., Mereďa P., Kučera J. 2015. Origin and systematic position of Jacobaea vulgaris (Asteraceae) octoploids: genetic and morphological evidence. Plant Systematics and Evolution, 301: 1517–1541. https://doi.org/10.1007/s00606-014-1163-0
26. Hovick S.M., Whitney K.D. 2014. Hybridisation is associated with increased fecundity and size in invasive taxa: meta-analytic support for the hybridisation-invasion hypothesis. Ecology Letters, 17(11): 1464–1477. https://doi.org/10.1111/ele.12355
27. Iakushenko D.M., Orlov O.O. 2015. New records of Utricularia australis (Lentibulariaceae) in Ukraine. Ukrainian Botanical Journal, 72(5): 468–473. https://doi.org/10.15407/ukrbotj72.05.468
28. iNaturalist. 2025–onward. Available at: www.inaturalist.org/ (Accessed 1 April 2025).
29. Kerner A. 1860. Niederösterreichische Weiden. Wien: Druck von Carl Ueberreuter, 160 pp. https://doi.org/10.5962/bhl.title.15620
30. Klesczewski M., Maciuga N., Giardi L., Davydov D.A., Allain P., Lecompte C. 2024. Molènes hybrides de France, 13 — Verbascum × schiedeanum Koch (V. lychnitis L. × V. nigrum L.). Carnets Botaniques, 196: 1–23. https://doi.org/10.34971/HC3H-7Y25
31. Klokov M.V. 1963. Heterolophus. In: Flora SSSR. Vol. 28. Eds B.K. Shishkin, E.G. Bobrov, S.K. Cherepanov. Moscow; Leningrad: Publisher of Academy of Science URSR, pp. 463–472.
32. Kotov M.I. 1960. Verbascum. In: Flora URSR. Vol. 9. Ed. M.I. Kotov. Kyiv: Publisher of the Academy of Sciences of Ukrainian SSR, pp. 407–431.
33. Koutecký P., Badurová T., Štech M, Košnar J., Karásek J. 2011. Hybridization between diploid Centaurea pseudophrygia and tetraploid C. jacea (Asteraceae): the role of mixed pollination, unreduced gametes, and mentor effects. Biological Journal of the Linnean Society, 104: 93–106. https://doi.org/10.1111/j.1095-8312.2011.01707.x
34. Lawrenko E.M. 1923. Centaurea orientalis × Scabiosa in Rossia australi. Notulae systematicae ex Herbario Horti Botanici Petropolitani, 6(5): 33–38.
35. Mosyakin S.L., Fedoronchuk M.M. 1999. Vascular plants of Ukraine. A nomenclatural checklist. Kyiv: M.G. Kholodny Institute of Botany, xxiv + 345 pp.
36. Mosyakin S.L., Shiyan N.M. 2019. Nomenclatural and taxonomic notes on Jacobaea borysthenica (Asteraceae) and some related taxa. Ukrainian Botanical Journal, 76(6): 473–485. https://doi.org/10.15407/ukrbotj76.06.473
37. Moysiyenko I. 2023. Checklist of vascular plants of the National Nature Park "Kamianska Sich" (Kherson region, Ukraine). Version 1.2. Kherson State University. Dataset https://doi.org/10.15468/725mp2 (Accessed 24 March 2025).
38. Moysiyenko I., Sudnik-Wójcikowska B., Dembicz I., Zachwatowicz M., Skobel N. 2023. Flora of kurgans in the "Wild Fields" (Ukraine). Version 1.3. Kherson State University. Dataset https://doi.org/10.15468/x4drnu (Accessed 24 March 2025).
39. Naliwaiko P.N. 1899. Catalogus plantarum sponte nascentium, quas annis 1891–1897 circa Charkowiam collegit. Travaux de la Société des naturalistes à l'Université Impériale de Kharkow, 33: 83–232.
40. Noé N. 2024. GBIF Occurences. QGIS GBIF API. Available at: https://github.com/BelgianBiodiversityPlatform/qgis-gbif-api (Accessed 14 October 2024).
41. Olshanskyi I. 2023. Hybrids of monocots in the flora of Ukraine: Preliminary synopsis. Biosystems Diversity, 31(4): 420–427. https://doi.org/10.15421/012350
42. Onyshchenko V.A., Mosyakin S.L., Korotchenko I.A., Danylyk I.M., Burlaka M.D., Fedoronchuk M.M., Chorney I.I., Kish R.Ya., Olshanskyi I.H., Shiyan N.M., Zhygalova S.L., Tymchenko I.A., Kolomiychuk V.P., Novikov A.V., Boiko G.V., Shevera M.V., Protopopova V.V. 2022. IUCN Red List categories of vascular plant species of the Ukrainian flora. Ed. V.A. Onyshchenko. Kyiv: FOP Huliaeva V.M., 198 pp.
43. Opredelitel vysshikh rasteniy Ukrainy. 1987. Eds Yu.N. Prokudin, D.N. Dobrochayeva, B.V. Zaverukha, V.I. Chopik, V.V. Protopopova, L.I. Kritskaya. Kyiv: Naukova Dumka, 548 pp.
44. Peregrym M.M., Didukh Ya.P. 2014. Asplenium × heufleri and Woodsia alpina on the Donetsk Upland. Ukrainian Botanical Journal, 71(1): 50–52. https://doi.org/10.15407/ukrbotj71.01.050
45. Peregrym M.M., Kuzemko A.A. 2010. New infragenic hybrid in the flora of Ukraine × Dactylocamptis uechtritziana (Hausskn.) M. Peregrym et Kuzemko, comb. nov. (Orchidaceae). Ukrainian Botanical Journal, 67(5): 655–662.
46. Peregrym M., Koopman J. 2023. Carex × takhtadjanii (Carex diluta × C. distans; Cyperaceae), a new hybrid for the flora of Ukraine. Hacquetia, 22(1): 1–6. https://doi.org/10.2478/hacq-2022-0011
47. Pobedimova E.G. 1954. Salvia. In: Flora SSSR. Vol. 21. Ed. B.K. Shishkin. Moscow; Leningrad: Publisher of Academy of Science URSR, pp. 350–353.
48. POWO. 2025–onward. Plants of the World Online. Facilitated by the Royal Botanic Gardens, Kew. Available at: https://powo.science.kew.org/ (Accessed 30 March 2025).
49. QGIS. 2024–onward. QGIS Home Page. Available at: https://qgis.org/en/site/ (Accessed 14 October 2024).
50. Ruhsam M., Jacobs T., Watson K., Hollingsworth P.M. 2014. Is hybridisation a threat to Rumex aquaticus in Britain? Plant Ecology & Diversity, 8(4): 465–474. https://doi.org/10.1080/17550874.2014.941956
51. Schmalhausen I. 1895. Flora of Middle and Southern Russia, Crimea, and Northern Caucasus. Vol. 1. Kyiv: Izdatelstvo Kievskogo universiteta, 468 pp.
52. Schmalhausen I. 1897. Flora of Central and Southern Russia, Crimea and the North Caucasus. Vol. 2. Kyiv: Izdatelstvo Kievskogo universiteta, xvi + 752 pp.
53. Shynder O.I., Davydov D.A., Olshanskyi I.G., Levon A.F., Nesyn Yu.D. 2024. New floristic records in Kyiv City and its environs. Ukrainian Botanical Journal, 81(2): 100–144. https://doi.org/10.15407/ukrbotj81.02.100
54. Shynder O., Negrash J. 2021. Checklist of the flora of the vicinity of Balakliya (Kharkiv Region, Ukraine): native and alien taxa, distribution of rare plants, new findings. Plant Introduction, 89/90: 13–71. https://doi.org/10.46341/PI2020043
55. Širajefv G., Lavrenko E. 1926. Conspectus criticus florae provinceae Charkoviensis. Pars 1. Pteridophyta et Monocotyledones. Brunae [Brno], 103 pp.
56. Stace C.A., Preston C.D., Pearman D.A. 2015. Hybrid flora of the British Isles. Bristol: Botanical Society of Britain & Ireland, 510 pp.
57. Tarieiev A., Olshanskyi I., Gailing O., Krutovsky K. 2019. Taxonomy of dark- and white-barked birches related to Betula pendula and B. pubescens (Betulaceae) in Ukraine based on both morphological traits and DNA markers. Botanical Journal of the Linnean Society, 191: 142–154. https://doi.org/10.1093/botlinnean/boz031
58. Tausch I.F. 1823. Hortus canalius, seu, Plantarum rariorum quae in Horto Botanico illustrissimi, ac excellentissimi Josephi Malabaila comitis de Canal coluntur, Icones et Descriptiones. Pragae [Prague/Praha]: Ex typo- et litho-graphia Theophili Haase. https://doi.org/10.5962/bhl.title.149853
59. Tomych M.V., Derzhypilskyi L.M. 2019. Znakhidky roslyn, zanesenykh do Chervonoi knyhy Ukrainy, v NPP Hutsulshchyna. In: Znakhidky roslyn ta hrybiv Chervonoi khyhy ta Bernskoi konventsii (Resolutsiia 6). T. 1. Ed. A.A. Kuzemko. Kyiv, Chernivtsi: Druk Art, pp. 353–357.
60. Thompson J.D., Gauthier P., Papuga G., Pons V., Debussche M., Farris E. 2018. The conservation significance of natural hybridisation in Mediterranean plants: from a case study on Cyclamen (Primulaceae) to a general perspective. Plant Biology, 20: 128–138. https://doi.org/10.1111/plb.12595
61. Turland N.J., Wiersema J.H., Barrie F.R., Gandhi K.N., Gravendyck J., Greuter W., Hawksworth D. L., Herendeen P.S., Klopper R.R., Knapp S., Kusber W.-H., Li D.-Z., May T.W., Monro A.M., Prado J., Price M.J., Smith G.F., Zamora Señoret J.C. 2025. International Code of Nomenclature for algae, fungi, and plants (Madrid Code). Chicago, USA: University of Chicago Press. [Regnum Vegetabile, vol. 162]. http://dx.doi.org/10.7208/chicago/9780226839479.001.0001
62. Tzvelev N.N. 1994. Achillea. In: Flora partis Europaeae URSS. T. 9. Ed. N.N. Tzvelev. St.-Petersburg: Nauka, pp. 117–127.
63. Tzvelev N.N. 1985. Notae de speciebus nonnullis florae partis Europaeae URSS. Novitates Systematicae Plantarum Vascularium, 22: 266–277.
64. Tzvelev N.N. 1986. De plantarum speciebus nonnulis pro parte Europaea URSS novis et raris. Novitates Systematicae Plantarum Vascularium, 23: 254–263.
65. UkrBIN. 2025–onward. UkrBIN: Ukrainian Biodiversity Information Network [public project & web application]. Available at: https://www.ukrbin.com (Accessed 20 January 2025).
66. Waldstein F.C., Kitaibel P. 1805. Descriptiones at icones plantarum rariorum Hungariae. Vol. 2. Viennae [Vienna / Wien]: Typis Matthiae Andreae Schmidt, Universit. Typogr., xxxii + 105–221 + tab. 101–200. Available at: https://bibdigital.rjb.csic.es/records/item/11189-descriptiones-et-icones-plantarum-rariorum-hungariae-vol-2
67. WFO. 2024–onward. World Flora Online. Available at: https://www.worldfloraonline.org/ (Accessed 14 October 2024).
68. Wissemann V. 2005. Evolution by hybridisation. The influence of reticulate evolution on biosymmetrical patterns and processes in plants. Theory in Biosciences, 123: 223–233. https://doi.org/10.1016/j.thbio.2004.09.003
69. Wong E.L., Hiscock S.J., Filatov D. 2022. The role of interspecific hybridisation in adaptation and speciation: Insights from studies in Senecio. Frontiers in Plant Science, 13: 907363. https://doi.org/10.3389/fpls.2022.907363
70. Yena A.V. 2012. Spontaneous Flora of the Crimean Peninsula. Simferopol: N. Orianda, 232 pp.
71. Zvyagintseva K.O. 2015. An annotated checklist of the urban flora of Kharkiv. Kharkiv: V.N. Karazin Kharkiv National University, 96 pp.