- Herbarium ID: SLU
- Accession Number: 008793
- Scientific Name: Carex castanea Wahlenb.
- Family Name: Cyperaceae
- Location: Small bay E of Portage Bay, Portage Bay, Conc. VIII, Mills Twp., Manitoulin Island, Ontario.
- District Located: Manitoulin
- Longitude/Latitude: 82.75W / 45.75 N
- Habitat: In damp hummocky ground along edge of pool in cedar woods.
- Notes: [no data]
- Collector: J.H. Soper & Keith Winterhalder
- Collection Number: 13575
- Collection Date: 07/13/1976
- Determined by: Keith Winterhalder
- Annotation by: [no data]