Aquatic and Wetland Vascular Plants of the Northern Great Plains
62. Cyperaceae, the Sedge Family
6. Eriophorum L. -- Cottonsedge
4. Eriophorum viridicarinatum (Engelm.) Fern.
Very similar to the preceding, differing mainly as follows: Sheaths not
dark-girdled at the summit, green throughout. Midvein of the scale broadening
toward the tip of the scale and reaching the tip. Bogs and swamps; rare, ne
ND and w MN; (Newf. to AK, s to NY, OH, MI, MN, ne ND, CO, and n ID).
Many previous records of this species were based on misidentified specimens
of E. polystachion.