- Herbarium ID: NHIC
- Accession Number: MJO8251
- Scientific Name: Carex atratiformis Britton
- Family Name: Cyperaceae
- Location: Aguasabon Gorge, near mouth of Aguasabon River, Terrace Bay, Ont.
- District Located: not specified
- Longitude/Latitude: 87.12111W / 48.77917 N
- Habitat: Rare and local, edge of Thuja/Picea/Larix/Betula woods near gorge.
- Notes: With Mitella nuda, Erigeron hyssopifolius, Pinguicula vulgaris, Cornus stolonifera.
- Collector: M.J. Oldham
- Collection Number: 17514
- Collection Date: 26-Jun-1995
- Determined by: not specified
- Annotation by: [no data]