Carex deweyana Schwein.

Montana: Lincoln County: Kootenai NF, Rainbow Lake, 24 miles N of Libby, MT off FS rd 68. Elev. 4237 ft.
T33N R32W S6
Datum: NAD 27. Uncertainty: 800 meters. Coordinate Source: TRS2LL.
Ca. 7 hectare lake surrounded by a floating Sphagnum mat on the E side and non-floating sedge fen on the S, W and N that covers and additional 7 hectares. Littoral regions of lake characterized by scattered clumps of Potamogeton amplifolius and Nuphar variegatum (neither very dense). Floating mat dominated by dense stand of Carex lasiocarpa, Menyanthes trifoliata, and C. interior. Sphagnum well-dev. in places, absent in others. Slightly raised, hummocky peatland margins dominated by C. lasiocarpa, C. lenticularis, and Calamagrostis canadensis. A stand of 7 m high Alnus incana borders peatland/upland forest. Forest mixed w/ Pien, Pico, Laoc, and few Abla. Water chem: hardness 25.8 CaCO3, Ca 6.2, Mg 2.4, K 0.8. Abundance: common with C. lasiocarpa, C. lenticularis, and C. rostrata on slightly raised peatland margin next to alder stand on well-decomposed, moist peat with no moss accum. Phenology: Fertile.

R. Bursik 1136, Jun 25, 1988
With C. Clemens
ID, Accession: 99381, Barcode: ID016800