Example of a geodesically pruned quasi-median network. Network constructed from 110 Beta vulgaris ssp. maritima 5S rDNA sequences. Cliff top populations are shown in green (locations: D, Durlston Head; OH, Old Harry; SC, Seacombe Cliff; StA, St. Aldhelm's Head; WS, Winspit) and harbour populations are shown in blue (B, Baiter; BB, Brands Bay; F, Furzey Island; HB, Holes Bay; SB, Sandbanks; WB, Wood Bar Looe). Unlabelled black nodes represent single latent vertices, labelled black nodes represent collapsed sets of equivalent latent vertices with the number displayed showing how many vertices this node represents. Edges present on high scoring geodesics are shown in black. The network shows a clear separation of the sequences from cliff top and harbour populations, in agreement with the genetic isolation displayed by these populations, as revealed by previous work with other analytical approaches [17-19].