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Ancestral state reconstructions of petal shape (a) and flower diameter (b) in Epimedium. The likelihood of occurrence of each state at each node is indicated by circles made of colored wedges of different size. The images on the upper left and upper right show the characteristics of the small-flowered (flat, slightly saccate, saccate, and short spur) and large-flowered (long spur) groups, respectively.
