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Northern Illinois University Herbarium

Specimen Records: 21,174
Media Records: 21,102
iDigBio Last Ingested Date: 2026-02-18

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 23,000 specimens of vascular plants plus an additional 8000 bryophytes. A large number of the bryophytes in the collection (about 6000 specimens) are 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.

Contacts

Namenone
Rolenone
Emailhelp@symbiota.org
Namenone
Rolenone
Emailhelp@symbiota.org
Namenone
Rolenone
Emailpsorensen@niu.edu
Name Paul Sørensen
RoleBotanist, Professor Emeritus and former curator
Emailpsorensen@niu.edu
Name Mel Duvall
RoleCurator and Professor Emeritus
Emailmel-duvall@niu.edu
Name Paul Sørensen
RoleBotanist, Professor Emeritus and former curator
Emailpsorensen@niu.edu
Name Mel Duvall
RoleCurator and Professor Emeritus
Emailmel-duvall@niu.edu
This table shows any data corrections that were performed on this recordset to improve the capabilities of iDigBio Search. The first column represents the correction performed. The last two columns represent the number and percentage of records that were corrected. A complete list of the data quality flags and their descriptions can be found here. Clicking on a data flag name will take you to a search for all records with this flag in this recordset.
FlagRecords With This Flag(%) Percent With This Flag
idigbio_isocountrycode_added  i21153
99.901
dwc_continent_added  i21144
99.858
rev_geocode_failure  i20976
99.065
rev_geocode_mismatch  i20974
99.055
dwc_datasetid_added  i17854
84.32
dwc_parentnameusageid_added  i17854
84.32
dwc_phylum_replaced  i17854
84.32
dwc_taxonomicstatus_added  i17854
84.32
gbif_canonicalname_added  i17854
84.32
gbif_genericname_added  i17854
84.32
gbif_taxon_corrected  i17854
84.32
dwc_taxonid_replaced  i17851
84.306
dwc_class_added  i17055
80.547
gbif_vernacularname_added  i16970
80.145
gbif_reference_added  i14951
70.61
dwc_multimedia_added  i14823
70.006
dwc_scientificnameauthorship_replaced  i11680
55.162
dwc_taxonrank_replaced  i10481
49.499
taxon_match_failed  i8094
38.226
dwc_originalnameusageid_added  i3795
17.923
dwc_taxonremarks_added  i2067
9.762
dwc_specificepithet_replaced  i1543
7.287
geopoint_low_precision  i863
4.076
dwc_genus_replaced  i521
2.461
dwc_infraspecificepithet_added  i457
2.158
dwc_scientificnameauthorship_added  i361
1.705
dwc_family_replaced  i328
1.549
dwc_kingdom_suspect  i99
0.468
dwc_class_replaced  i34
0.161
dwc_infraspecificepithet_replaced  i30
0.142
dwc_order_replaced  i26
0.123
geopoint_datum_missing  i11
0.052
dwc_acceptednameusageid_added  i6
0.028
dwc_stateprovince_replaced  i5
0.024
dwc_genus_added  i4
0.019
dwc_country_replaced  i3
0.014
dwc_specificepithet_added  i3
0.014
dwc_taxonid_added  i3
0.014
dwc_taxonrank_added  i3
0.014
datecollected_bounds  i2
0.009
dwc_taxonremarks_replaced  i2
0.009
geopoint_datum_error  i1
0.005