Genus:
Rumex L.

Rumex × borbasii Błocki

This species is accepted, and its native range is Europe.

[KBu]

Pliszko, A. (2019). Typification of two natural hybrids in Rumex (Polygonaceae). Kew Bulletin 74: 17. https://doi.org/10.1007/s12225-019-9803-8

Morphology Leaves
Rumex ×borbasii has the wide basal and lower stem leaves similar to those of R. confertus, but they are thinner in texture and the midrib bears some indumentum abaxially resembling R. obtusifolius
Morphology Reproductive morphology Inflorescences
The panicle of Rumex × borbasii is lax with irregularly maturing tepals, however, the well-developed tepals are tubercled, broad with a subacute apex, and bear shortly toothed margins (Stace et al. 2015).
Note
The flowers of R. ×borbasii are irregular in maturing and appear sterile, however, some individuals produce a low number of seeds (Snogerup 2000; Stace et al. 2015). Interestingly, in countries where R. confertus is considered alien (e.g. Lithuania, Poland, Sweden, UK) its hybrids also should be treated as alien taxa, following the concept proposed by Pyšek et al. (2004), and a proper recognition of spontaneous hybrids between alien R. confertus and its native congeners is important to control their negative impacts. Originally, the hybrid involving Rumex confertus and R. obtusifolius was described under the name R. ×kerneri Błocki (Błocki 1888a). However, its name was changed when Błocki (1889) found out that the epithet had already been applied to another Rumex species by Borbás (1884), namely R. kerneri Borbás. The name of R. ×borbasii was given by Błocki in honour of Vincze von Borbás, a Hungarian botanist. In the protologue of R. ×borbasii (Błocki 1888a, 1889), two localities near Lviv (i.e., Zamarstyniv and Holosko Velyke) were mentioned as loci classici. Nowadays, Zamarstyniv is one of the boroughs of the city of Lviv and Holosko Velyke is a suburb of Lviv (western Ukraine). The specimens proposed herein as lectotype and isolectotype were collected in Holosko (short version of the name of Holosko Velyke) and are the most informative original material available and they match Błocki’s protologue.
Type
Ukraine, Holosko (Lviv), unknown date, B. Błocki s.n. (lectotype LW [LW00058082]!, selected here; isolectotype LW [LW00058081]!).

Native to:

Austria, Finland, Romania, Spain, Ukraine

Introduced into:

Great Britain

Rumex × borbasii Błocki appears in other Kew resources:

First published in Oesterr. Bot. Z. 39: 155 (1889)

Accepted by

  • Akeroyd, J.R. (2013). Docks and Knotweeds of Britain and Ireland: 1-258. Botanical Society of Britain and Ireland.
  • Jonsell, B. (ed.) (2000). Flora Nordica 1: 1-344. The Bergius Foundaton.
  • Stace, C.A. (1975). Hybridization and the Flora of the British Isles: 1-626. Academic Press, London, New York, San Francisco.
  • Stace, C.A., Preston, C.D. & Pearman, D.A. (2015). Hybrid flora of the British isles: 1-501. Botanical Society of Britain and Ireland.

Literature

Kew Bulletin

  • Borbás, V. (1884). Temes megye vegetatiója (Flora Comitatus Temesiensis). Emlékmüböl, Nyomatott Magyar Testvéreknél, Temesvárot.
  • Błocki, B. (1888a). Rumex Kerneri n. hybr. (R. conferto × obtusifolius). Oesterr. Bot. Z. 38: 365 – 366.
  • Błocki, B. (1888b). Rumex Skofitzii n. hybr. (R. conferto × crispus). Oesterr. Bot. Z. 38: 340 – 341.
  • Błocki, B. (1889). Flora von Oesterreich-Ungarn. B. Galizien. Oesterr. Bot. Z. 39: 154 – 155.
  • Błocki, B. (1892). Ein kleiner Beitrag zur Flora von Galizien. Oesterr. Bot. Z. 42: 349 – 352.
  • Daehler, C. C. & Carino, D. A. (2001). Hybridization between native and alien plants and its consequences. In: J. L. Lockwood & M. L. McKinney (eds), Biotic Homogenization, pp. 81 – 102. Kluwer Academic/Plenum Publishers, New York.
  • Hujerová, R., Gaisler, J., Pavlů, L., Pavlů, V. & Mandák, B. (2013). Hybrid of Rumex patientia × Rumex tianschanicus (Rumex OK-2) as a potentially new invasive weed in Central Europe. Grassland Science in Europe 18: 466 – 468.
  • Mosyakin, S. L. (2005). Rumex Linnaeus. In: Flora of North America Editorial Committee, Flora of North America North of Mexico, Vol. 5, Magnoliophyta: Caryophyllidae, part 2: 489 – 533. Oxford University Press, New York, Oxford.
  • Pyšek, P., Richardson, D. M., Rejmánek, M., Webster, G. L., Williamson, M. & Kirschner, J. (2004). Alien plants in checklists and floras: towards better communication between taxonomists and ecologists. Taxon 53: 131 – 143.
  • Rechinger, K. H. (1984). Rumex (Polygonaceae) in Australia: a reconsideration. Nuytsia 5: 75 – 122.
  • Snogerup, S. (2000). Rumex L. subgenus Rumex. In: B. Jonsell (ed.), Flora Nordica, Vol. 1: 281 – 318. Bergius Foundation, Stockholm.
  • Stace, C. A., Preston, C. D. & Pearman, D. A. (2015). Hybrid flora of the British Isles. Botanical Society of Britain and Ireland, Bristol.
  • Turland, N. J., Wiersema, J. H., Barrie, F. R., Greuter, W., Hawksworth, D. L., Herendeen, P. S., Knapp, S., Kusber, W.-H., Li, D.-Z., Marhold, K., May, T. W., McNeill, J., Monro, A. M., Prado, J., Price, M. J. & Smith, G. F. (eds) (2018). International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Veg. 159, Koeltz Botanical Books, Glashütten.

Kew Backbone Distributions

  • Stace, C.A. (1975). Hybridization and the Flora of the British Isles: 1-626. Academic Press, London, New York, San Francisco.

  • Kew Backbone Distributions

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

  • Kew Bulletin

    Kew Bulletin
    http://creativecommons.org/licenses/by-nc-sa/3.0

  • Kew Names and Taxonomic Backbone

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0