- Herbarium ID: NHIC
- Accession Number: MJO12294
- Scientific Name: Carex gravida L.H.Bailey
- Family Name: Cyperaceae
- Location: Manitou Mounds, N shore Rainy River, approx. 6 km W of Barwick, Ont.
- District Located: not specified
- Longitude/Latitude: 94.06028W / 48.64583 N
- Habitat: Local (but 50+ plants) in open mesic prairie remnant near river.
- Notes: With Zizia aurea, Sanicula marilandica, Vicia americana, Agastache foeniculum.
- Collector: M.J. Oldham & W.D. Bakowsky
- Collection Number: 20819
- Collection Date: 23-Jun-1998
- Determined by: M.J. Oldham
- Annotation by: A.A. Reznicek 1998.