| Classification | Cyperaceae: Carex |
| Harvard University Herbaria Barcode(s) | 00027257 |
| Type Status | Holotype |
| Collector | F. V. Hayden |
| Country | United States of America |
| State | South Dakota |
| Geography | North America: North America (CA, US, MX) (Region): United States of America: South Dakota |
| Locality | On Missouri River near Fort Pierre |
| Date Collected | 1853 |
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/792e2010-1b30-4e28-a4bb-e799d9b1e001 |
| Harvard University Herbaria Barcode | 00027257 |
| Herbarium | GH |
| Family | Cyperaceae |
| Type Status | Holotype |
| Holotype of | Carex haydenii Dewey |
| Verified by | Standley, Lisa Anne |
| Date Determined | 1986 |
| Determination Remarks | [filed under] |
| Annotation Text | HOLOTYPE |
| Taxon Reference | (for Carex haydenii Dewey) Amer. J. Sci. Arts 1854. ser. 2, 18: 103. |
| Family | Cyperaceae |
| Determination | Carex aperta Boott |
| Determination Remarks | [current name] |
| Annotation Text | nearer typical form |
| Sex | not determined |
| Phenology | NotDetermined |
| Preparation Type | Sheet |
| Preparation Method | Pressed |
