The floristic region overlaps four distinct mammalian faunal regions. A significant floristic and faunal diversity is a characteristic of the preserve. Moreover, many plant taxa are shared with one of the four neighboring floristic regions only. Endemic rubiaceous genera are found in most tropical and subtropical floristic regions of the world. Plants are grouped into floras based on region (floristic regions), period, special environment, or climate. Patches of forest with Afromontane floristic affinities occur all along the mountain chains. The floristic Boreal Kingdom corresponds to the Holarctic realm. Conservation International declared the Cape floristic region to be a biodiversity hotspot. Biogeographic realms correspond to the floristic kingdoms of botany or zoogeographic regions of zoology. From a floristic standpoint, each of these climate zones have generally temperate vegetation. The Caatinga has enough endemic species to constitute a floristic province. Specific studies show correlations between the floristic composition and predatory behaviour. Almost all regions are further subdivided into floristic provinces. The kingdom is subdivided into three floristic subkingdoms and nine floristic regions. The rank corresponds more or less to the floristic kingdoms and zoogeographic regions.