The University of Arizona Herbarium (ARIZ) is a research collection of over 420,000 dried plant specimens, with emphasis on the plants of the Sonoran Desert region and adjacent areas of the southwestern United States and northwestern Mexico.

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

We are open to researchers and the general public Monday to Friday from 8:30 am to 4:30 pm, and we can be reached at or 520-621-7243.

Explore our site to learn more about the herbarium.


Learn about the people who work here.


Take a look at our history.


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Read about our policies.