Department of Ecology, Evolution, and Organismal Biology

Ada Hayden Herbarium (ISC)

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herbarium logo
Logo design by our friend and colleague Anna Gardner (1958-2006).

The Ada Hayden Herbarium

has the largest collection of Iowa plants and fungi, containing over 600,000 specimens of vascular plants, bryophytes, fungi, and lichens. Functioning primarily as a research facility important for taxonomic studies (occurrence, distribution, and relationships of plants), it is also used for identifying unknown plants. Specimens are loaned to specialists at other institutions around the world to support research. Loans from other institutions allow our researchers access to other herbaria. Recently, herbaria have become a source of materials to use in molecular studies and to support basic research on biodiversity.

What would happen without plant taxonomists?

Read The Disappearance by Dr. Duane Isley to find out.

Reprinted from Taxon 21(1): 3-12. February 1972.

Help Wanted

Coefficients of Conservatism for Iowa Plants

What is a herbarium?

A herbarium is a plant library, containing dried and pressed plants.

Gossypium herbaceum L. Collected in the Bessey Hall Greenhouse by J.F. Wendel and T.D. Couch, 1988.

Learn More...

See some examples of herbarium sheets !

Database development and bryophyte curation supported by National Science Foundation grant BRC-0646166