- Herbarium ID: NHIC
- Accession Number: MJO8449
- Scientific Name: Carex x knieskernii Dewey (C. arctata x C. castanea)
- Family Name: Cyperaceae
- Location: Hwy 17, N roadside ditch, opposite logging road, approx. 20 km E of Marathon, Ont.
- District Located: not specified
- Longitude/Latitude: 86.11278W / 48.68583 N
- Habitat: Edge of woods, single clump.
- Notes: Sterile?, sub castanea det. M.J.O, although spikes are quite thick - A.A. Reznicek.
- Collector: M.J. Oldham & W.D. Bakowsky
- Collection Number: 17688
- Collection Date: 3-Aug-1995
- Determined by: A.A. Reznicek Nov. 1995.
- Annotation by: [no data]