Home Cyperaceae Eriophorum

Eriophorum virginicum L.

Common Name: TAWNY COTTON-GRASS
Coefficient of Conservatism: 8
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Sedge

Bogs, conifer swamps (tamarack, spruce, cedar), boggy thickets, marshes, and open swampy or boggy ground; only in acidic soils.

This is the most frequent Eriophorum of acidic soils in southern Michigan. The bristles are typically copper colored to tan. They are white in the rather frequent f. album (A. Gray) Wiegand.

This species flowers much later than other Eriophorum, and  is visible in bogs until late fall, the tawny heads standing out when the rest of the vegetation is in fall color. All other species are long disintegrated by this time. 

The inflorescece is white when in bloom, rather like a giant Rhynchospora alba, the bristles turning tawny only later (if at all).

R. Schipper

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Counties
Alger
Allegan
Antrim
Arenac
Baraga
Barry
Bay
Benzie
Berrien
Calhoun
Cass
Charlevoix
Cheboygan
Chippewa
Crawford
Delta
Dickinson
Emmet
Gogebic
Grand Traverse
Hillsdale
Houghton
Ingham
Iron
Jackson
Kalamazoo
Kalkaska
Kent
Keweenaw
Lake
Lapeer
Leelanau
Lenawee
Livingston
Luce
Mackinac
Macomb
Manistee
Marquette
Mason
Mecosta
Menominee
Montcalm
Muskegon
Newaygo
Oakland
Ontonagon
Ottawa
Presque Isle
Roscommon
Sanilac
Schoolcraft
St. Clair
St. Joseph
Van Buren
Washtenaw

Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March, 17, 2025
https://lsa-miflora-p.lsait.lsa.umich.edu/#/record/1127