Population genetic structure of Hosta Clade 1 and Clade 4 A, E changes of ΔΚ with K in Clades 1 and 4, respectively B a diagram showing the result of STRUCTURE analysis for Clade 1 at K=3 C a diagram showing the result of hierarchical STRUCTURE analysis for H. polyneuronoides and H. tardiva subsp. densinervia D diagrams showing the results of hierarchical STRUCTURE analysis for H. shikokiana and six related species at K=3 and 5 F diagrams showing the results of STRUCTURE analysis for Clade 4 at K=2, 3, and 8.