The University of Arizona Herbarium (ARIZ) is a research collection of over 440,000 dried plant specimens, with emphasis on the plants of the Sonoran Desert region and adjacent areas of the southwestern United States and northwestern Mexico.

HOURS: The UA Herbarium is usually open 8:30-4:30. Although we prefer appointments, you are welcome to stop by. During the summer, we recommend calling in advance; there may be days with no staff available due to fun vacations or plant collecting trips :)

CONTACT US: We are also available by email and by phone, and we look forward to seeing and/or hearing from you: herbarium @, 520 621-7243

NEWS: We are in the middle of a major fund-raising campaign! If you would like to know more, please reach out. Donor support makes immense impact by helping us train the next generation of plant biodiversity and museum experts (yes, our wonderful students!).

If you are interested in donating online, please click on this link which will take you directly to the
Herbarium General Fund at the UA Foundation

In Memorium: In April, 2022, we gathered for a celebration of the life and legacy of Richard Felger. Full length video is available here.



Search our collection of over 400,000 specimens.


Visit the Gilbertson Mycological Herbarium.


ARIZ works closely with a number of researchers in Arizona and around the country.


ARIZ is dedicated to identifying plants for members of the public, Arizona producers, Poison Control, anyone.

Featured projects


Weekly seminars are scheduled throughout the academic year.


Occasional workshops provide training in plant identification and more.

Section 6 Grants

Rare plant research: next deadline Dec 8, 2023


Searchable database of our extensive botanical library

Legumes of Arizona

Legumes of Arizona: An Illustrated Flora and Reference will be a comprehensive account of the family Fabaceae in Arizona.

Flora of SW Arizona

ARIZ Associated Researchers are documenting modern and fossil plant diversity.


It is an ongoing effort to find funding to keep these projects alive, protect our specimens, and serve the public.


We are imaging our nearly 1500 type specimens.
For a complete listing of our projects, past and present, see our Projects page