Total Number of Species
Source: The Nature Conservancy and Association for Biodiversity Information
Map Description:
This map depicts the total number of species per state in the U.S. The map and text are from the excellent publication entitled "Precious Heritage: The Status of Biodiversity in the United States", by The Nature Conservancy and Association for Biodiversity Information.(fig. 5.1a, pg. 124). The most diverse states generally stretch coast to coast across the southern portion of the country. California and Texas, both with more than 5,500 species, lead the nation in number of native species, while three other states- Arizona, New Mexico, and Georgia- harbor more than 4,000 species. Although not in the top tier, Alabama and Florida, two other species-rich southeastern states, both support more than 3,800 species. At the other end of the spectrum, Rhode Island, Alaska, North Dakota, and Hawaii have the fewest.

Cautions for this Product:
Combining native species of vascular plants, vertebrates, and two invertebrate groups, mussels and crayfish, creates an aggregate data set representing 19,101 species. This map depicts overall patterns which refer only to regularly occurring native species in these plant and animal groups. A great many other species of invertebrates, nonvascular plants, algae, fungi, and microorganisms also are found in these states. However, currently, comprehensive information on these groups, which would enable their inclusion in an analysis of overall state-level diversity patterns, is unavailable.
Map used with permission from The Nature Conservancy and Oxford Press.

For Further Information:
"Precious Heritage: The Status of Biodiversity in the United States", B. Stein, L. Kutner and D. Adams, editors. Oxford Press. 2000.