Fallopia ×moravica (Polygonaceae), a new hybrid between Fallopia compacta and F. sachalinensis

IVA HODÁLOVÁ; LENKA MÁRTONFIOVÁ; KATARÍNA SKOKANOVÁ; STANISLAV ŠPANIEL; PAVOL MEREĎA Jr.

doi:10.11646/phytotaxa.572.2.1

Issue: Vol. 572 No. 2: 10 November 2022

Type: Article

Published: 2022-11-10

DOI: 10.11646/phytotaxa.572.2.1

Page range: 123-143

Abstract views: 98

PDF downloaded: 100

***Fallopia* ×moravica (Polygonaceae), a new hybrid between Fallopia compacta and *F. sachalinensis***

IVA HODÁLOVÁ⁺⁻
LENKA MÁRTONFIOVÁ⁺⁻
KATARÍNA SKOKANOVÁ⁺⁻
STANISLAV ŠPANIEL⁺⁻
PAVOL MEREĎA Jr.⁺⁻

Institute of Botany, Plant Science and Biodiversity Centre, Slovak Academy of Sciences, Dúbravská cesta 9, SK-845 23 Bratislava, Slovakia

Botanical Garden of P. J. Šafárik University in Košice, Mánesova 23, SK-043 52 Košice, Slovakia

Institute of Botany, Plant Science and Biodiversity Centre, Slovak Academy of Sciences, Dúbravská cesta 9, SK-845 23 Bratislava, Slovakia

alien flora Bohemian knotweed flow cytometry hybridisation invasion Moravia Reynoutria Eudicots

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Abstract

A new knotweed hybrid originating from the crossing of Fallopia compacta and F. sachalinensis is described based on plant material collected in the Moravia region in the Czech Republic as F. ×moravica. In addition to the Czech Republic, the hybrid has also been reported previously from the United Kingdom and New Zealand; however, it was not distinguished from F. ×bohemica, a hybrid between F. japonica and F. sachalinensis, since its one parent (F. compacta) has been generally treated only as a variety of F. japonica. F. ×moravica differs from the morphologically most similar hexaploid (2n = 6x = 66) F. ×bohemica by its tetraploid (2n = 4x = 44) number of chromosomes and by the constant absence of purple spots on stem internodes (which are usually present in F. ×bohemica). The new hybrid also differs from F. ×bohemica as well as other European Fallopia members by its unique relative genome size. Other potential morphological and cytological differences of F. ×moravica from the related F. ×bohemica are discussed.

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