Index Herbariorum

For the past three centuries, scientists have documented the earth's plant and fungal diversity through dried reference specimens maintained in collections known as herbaria. There are approximately 3,000 herbaria in the world today, with approximately 12,000 associated curators and biodiversity specialists. Collectively the world's herbaria contain an estimated 350,000,000 specimens that document the earth's vegetation for the past 400 years. Index Herbariorum is a guide to this crucial resource for biodiversity science and conservation.

The Index Herbariorum (IH) entry for an herbarium includes its physical location, URL, contents (e.g., number and type of specimens), founding date, as well as names, contact information and areas of expertise of associated staff. Only those collections that are permanent scientific repositories are included in IH. New registrants must demonstrate that their collection is accessible to scientists, and is actively managed. Each institution is assigned a permanent unique identifier in the form of a one to eight letter code, a practice that dates from the founding of IH in 1935.

The first six editions of Index Herbariorum were published by the International Association for Plant Taxonomy in the Netherlands (1952–1974). Dr. Patricia Holmgren, then Director of the New York Botanical Garden, served as co-editor of edition 6, and subsequently became the senior editor of IH. She oversaw the compilation of hard copy volumes 7 and 8, and Dr. Noel Holmgren, a scientist on the NYBG staff, oversaw the development of the IH database, which became available on-line in 1997. In September 2008, Dr. Barbara M. Thiers, Director of the NYBG Herbarium, became the editor of IH.

Search by Herbarium Code

Use the field below to search the database using the herbarium code as the search criteria. Enter the herbarium code in the field and press the Search button to execute the query.

Search by Name or Location

Use the appropriate box to search the database for any of the following fields. Press the Search button to execute the search.

Search for a Person

Search for a herbarium staff member by entering the appropriate search criteria in the relevant fields below. Press the Search button to execute the search.

Map All Herbaria

We welcome corrections to the geocoordinates for herbaria. Our goal is to make the position of the pointer for each herbarium as accurate as possible. If possible, please submit corrected coordinates for the exact building in which the herbarium is housed, preferably in decimal format, e.g., 45.513104,-122.686145). Corrections can be entered using the ”Send comment or correction to the Editor of Index Herbariorum” feedback link, which can be found in each herbarium record. The map is updated every month.

Map all Herbaria!

Index Herbariorum Annual Report

The first Index Herbariorum annual report, "The World's Herbaria 2016", is now available for download here.

How to Cite IH

Thiers, B. [continuously updated]. Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden's Virtual Herbarium.

Where to Send Updates and Corrections

Please review the entry for your Herbarium and send any updates and corrections to: Barbara M. Thiers,

How to Register for Index Herbariorum

Download the registration form, enter the data about your herbarium electronically, and email the completed form to For an example of a completed form, download the Index Herbariorum Registration Form Example.