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Ordination plot of the first and second linear discriminant functions of the six populations per Rhododendron taxon based on the discriminating variables RGR leaf length, leaf length–width ratio, root biomass, and shoot–root ratio. Proportion of explained variance for axis LD1 = 87.76%, LD2 = 6.72%. C = North American R. catawbiense; M = North American R. maximum; I = invasive Irish R. ponticum; E = native Spanish R. ponticum; G = native Georgian R. ponticum.
