Map of Urtica sample sites. Squares: diploids; diamonds: tetraploids; red line = route of transect (Lat. = latitude, Long. = longitude).

 
  Part of: Cronk Q, Hidalgo O, Pellicer J, Percy D, Leitch I (2016) Salix transect of Europe: variation in ploidy and genome size in willow-associated common nettle, Urtica dioica L. sens. lat.,from Greece to arctic Norway. Biodiversity Data Journal 4: e10003. https://doi.org/10.3897/BDJ.4.e10003