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Minimum spanning tree of amphiploids and parental species (OTUs) of the genus Avena in an ordination space (x-, y-, and z-axes) and created by application of Kruskal’s non-metric multidimensional scaling method (Rohlf 1994). OTUs were described by eight disorder traits of the aleurone layer {red arrows for an average for parental species (PS) and for amphiploids (A); other abbreviations in the accession list; a red dotted line separates species and amphiploids}. (Color figure online)
