| Pairs of Closely related Species with the Same Chromosomal Numbers Differing in Morphology and Ecological Preferences | ||
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| Geum urbanum: dry habitats | Geum rivale: moist habitats |
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| Primula vulgaris: shadowy places | Primula veris: sunny places |
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| Silene maritima: coast | Silene vulgaris: inland |
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| Silene alba | Silene dioica |
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| Quercus robur: heavy soils | Quercus petraea: light soils |
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| Epilobium hirsutum | Epilobium parviflora |
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| Viola odorata | Viola hirta |
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