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Northern Illinois University Herbarium

Specimen Records: 21,439
Media Records: 21,370
iDigBio Last Ingested Date: 2026-04-23

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
Emailhbrown@mailbox.sc.edu
Namenone
Rolenone
Emailhbrown@mailbox.sc.edu
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  i21418
99.902
dwc_continent_added  i21409
99.86
dwc_datasetid_added  i18061
84.244
dwc_parentnameusageid_added  i18061
84.244
dwc_phylum_replaced  i18061
84.244
dwc_taxonomicstatus_added  i18061
84.244
gbif_canonicalname_added  i18061
84.244
gbif_genericname_added  i18061
84.244
gbif_taxon_corrected  i18061
84.244
dwc_taxonid_replaced  i18058
84.23
dwc_class_added  i17259
80.503
gbif_vernacularname_added  i17173
80.102
gbif_reference_added  i15126
70.554
dwc_multimedia_added  i15002
69.975
dwc_scientificnameauthorship_replaced  i11803
55.054
dwc_taxonrank_replaced  i10607
49.475
taxon_match_failed  i8209
38.29
dwc_originalnameusageid_added  i3824
17.837
dwc_taxonremarks_added  i2104
9.814
dwc_specificepithet_replaced  i1565
7.3
geopoint_low_precision  i866
4.039
dwc_genus_replaced  i528
2.463
dwc_infraspecificepithet_added  i464
2.164
dwc_scientificnameauthorship_added  i361
1.684
dwc_family_replaced  i334
1.558
rev_geocode_eez  i297
1.385
dwc_kingdom_suspect  i99
0.462
dwc_class_replaced  i34
0.159
dwc_infraspecificepithet_replaced  i32
0.149
dwc_order_replaced  i27
0.126
rev_geocode_mismatch  i18
0.084
geopoint_datum_missing  i11
0.051
dwc_acceptednameusageid_added  i6
0.028
dwc_stateprovince_replaced  i5
0.023
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0.019
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0.014
dwc_taxonid_added  i3
0.014
dwc_taxonrank_added  i3
0.014
dwc_taxonremarks_replaced  i3
0.014
datecollected_bounds  i2
0.009
rev_geocode_corrected  i2
0.009
dwc_country_replaced  i1
0.005
geopoint_datum_error  i1
0.005
rev_geocode_failure  i1
0.005
rev_geocode_lat_sign  i1
0.005
rev_geocode_lon_sign  i1
0.005