We are located in historic Herring Hall on the campus of the University of Arizona in Tucson, Arizona, USA.

With over 400,000 specimens, ARIZ is the world's largest collection of plants from Arizona and Sonora, Mexico.

These collections support a rich diversity of research projects by herbarium staff and university researchers. We also serve the general public, private organizations, and government agencies of all levels as a provider of information on the plants of Arizona and the Sonoran Desert region.

Explore the many resources at ARIZ by following the links in the menu bar at the top.

Click here to search our specimens

See our new Fall 2011 schedule of upcoming Herbarium Lunch talks...