All species of plants that are found in a particular region, period, or special environment. Six floral kingdoms are commonly distinguished: Boreal, Paleotropical, Neotropical, South African, Australian, and Antarctic. These kingdoms are further broken down into subkingdoms and regions, over which there is some dispute.

This entry comes from Encyclopædia Britannica Concise.
For the full entry on flora, visit Britannica.com.

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