Quick Search

Search by Catalog Number, Occurrence ID, or Record ID. More information about catalog number Search by Catalog Number, Occurrence ID, or Record ID.

Northern Illinois University Herbarium (DEK)

Bionomia dataset badge

The herbarium at NIU is an internationally recognized systematic collection, initiated in the 1960s and enlarged significantly during the 1970s to the present. Holdings presently total about 19,000 specimens of vascular plants plus an additional 8000 bryophytes. A very large portion of the bryophytes (about 6000 specimens) is on permanent loan to MO (Missouri Botanic Garden).

Special collections include a definitive collection of the genus Dahlia, which contains holotypes and isotypes plus a thoroughly documented array of hybrids between authenticated wild species. A second important collection is of Arbutus that also includes type material. The troublesome genus Agrimonia is more completely documented at DEK than at any other herbarium in the world. In Zygophyllaceae, there is a substantial collection of species of Guaiacum, for which sequenced marker loci are indicated. The collection also emphasizes grassland species and those for which genetic resources, especially complete plastome sequences, are available.

DEK presently maintains exchange relationships with more than 26 domestic and 6 foreign herbaria. As a consequence, coverage, while emphasizing the flora of Illinois, is worldwide.


  • Botanist, Professor Emeritus and former curator: Paul Sørensen, psorensen@niu.edu
  • Curator and Professor Emeritus: Mel Duvall, duvallmel@gmail.com, 815-766-0824 (ORCID #: 0000-0001-8143-9442)


Department of Biological Sciences
Northern Illinois University
Faraday Hall
DeKalb, Illinois   60115

Collection Statistics

  • 11,876 specimen records
  • 11,804 (99%) georeferenced
  • 11,840 (100%) with images (11,888 total images)
  • 60 GenBank genetic references
  • 11,538 (97%) identified to species
  • 136 families
  • 932 genera
  • 2,961 species
  • 3,301 total taxa (including subsp. and var.)

Extra Statistics

Collection Type: Preserved Specimens
Management: Live Data managed directly within data portal
Last Update: 10 August 2014
Global Unique Identifier: 611fe4d6-8e33-4b97-9d2a-ba1c34d20dda
Digital Metadata:EML File
Geographic Distribution - South Africa
Click on the specimen record counts within the parenthesis to return the records for that term