- Herbarium ID: NHIC
- Accession Number: MJO8209
- Scientific Name: Carex x knieskernii Dewey (C. arctata x C. castanea)
- Family Name: Cyperaceae
- Location: Ravine Lake Trail, Sibley Peninsula, Sleeping Giant Provincial Park, Lake Superior, Ont.
- District Located: not specified
- Longitude/Latitude: 88.81778W / 48.34472 N
- Habitat: Single robust clump along trail with Carex arctata (# 17481).
- Notes: Carex castanea seen elsewhere along trail.
- Collector: M.J. Oldham
- Collection Number: 17475
- Collection Date: 25-Jun-1995
- Determined by: M.J. Oldham
- Annotation by: A.A. Reznicek 1995.