Welcome to ARIZ, the University of Arizona Herbarium

We are located in historic Herring Hall on the campus of the University of Arizona in Tucson, Arizona, USA. Check out the new University of Arizona campus map to find us!

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.


Section 6 Program: 2014 awards will be announced soon.


Search our specimens


Herbarium Lunch
Schedule of talks for Fall 2014 is under development; please contact us if you'd like to hear announcements or give a presentation.


Please consider donating to the UA Herbarium. Any amount helps!


In Memoriam Dr. Charles T. Mason