![]() ![]() More than 50% of the species have extremely small distribution ranges, resulting in potential threat and insufficient coverage by existing protected areas. ![]() Overall diversity patterns of the family, as well as, diversity patterns of all taxonomic subgroups, growth forms, and pollination syndromes are presented and mapped on the phylogeny of the Cactaceae. On this basis, we identified and characterized seven geographical centers of cactus diversity. In this volume, the distribution areas of all cactus species are mapped. ![]() Due to their high value as ornamental plants, countless publications with data on ecological preferences and geographic occurrence of the species are available. Recent revisions and molecular studies resulted in an improved knowledge of the phylogeny and taxonomy of this group. 1,435 species are the most important plant family of the arid regions of the Americas. ![]()
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