Supplementary material
Table S1 – Parental combinations of British flowering plant
species which are of different ploidy level and have produced putative
hybrids . Hybrid combinations extracted from the ‘Hybrid Flora of the
British Isles’ (Stace, 2015) and presented using the same taxonomic
system and in the same order, with ploidy and chromosome number compiled
in Brown et al (2023).
Table S2 – Search strings to find examples of cross-ploidy
hybridisation. Searches were performed in Google Scholar. Examples from
other sources were added if they were deemed to be important and/or well
known.
Figure S1 – The distribution of ploidy levels across the
British and Irish flora between species in the four families with the
highest number of species. Shown are Rosaceae, Poaceae, Asteraceae and
Fabaceae. Each family has distinct distributions of ploidy levels.