Introduction.- Historical overview.- Material and methods.- Morphology.- Chromosome numbers.- Breeding system.- Phytochemistry.- Distribution and habitats.- Relationship based on DNA markers and classification.- Conspectus of classification.- Taxonomy.- Miscellaneous doubtful and not validly published names.- Hybrids.- Acknowledgments.- Literature cited.- Appendix 1. Chromosome counts of geranium.- Appendix 2. Names of geranium belonging to other genera.- Index to numbered collections examined.- Index to scientific names.- Index to new names and combinations.
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