United States: Flora

• 19,262 identified species – about 5.1% of the world’s nearly 400,000 plant species

• Includes 16,499 flowering plants. 
• Includes 641 tree species (including 130 that are threatened)
• Includes 658 fern species.
• 660 plants are classified as threatened or endangered.

(Numbers are approximate due to various reporting methods by varied qualified organizations.)

Flora and Fauna Data Sources: US Fish & Wildlife Service | University of Utah-Department of Biology | National Wildlife Federation | Current Results – Weather & Science Facts | US National Park Service | US Forest Service | Wageningen University & Research | Smithsonian Institution – Number of Insects | OrcaEyes | World Atlas – Megadiverse Countries | International Union for Conservation of Nature | Environmental Protection Agency – Endangered Species Facts | Alaskan Nature | Alaska Department of Fish & Game | Alaska Forest Facts | Hawaii Biological Survey | Hawaiian Tropical Dry Forests | Anarchimdedia – Puerto Rico |