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Maximum similarities of the (left side) ecological distribution and (right side) suitable areas for diosgenin-contained species from Dioscorea. a D. deltoidea, b D. nipponica, c D. collettii, d D. composita, e D. spiculiflora, f D. sylvatica, g D. althaeoides, h D. zingiberensis, i D. gracillima, j D. panthaica
