Fimbristylis autumnalis (L.) Roem. & Schult.
Coefficient of Conservatism: 6
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt A-Sedge

Sandy, marly, or peaty hollows and shores, especially where water levels have lowered; often abundant in a distinct zone. Very local northward.

Fimbristylis autumnalis is highly variable in size and whether erect or more or less prostrate, likely relating to how early in the season plants were able to germinate on the drawdown shores. Minute plants with just one spikelet can occur, and plants can rarely be up to 50 cm tall, with diffusely branched inflorescences. Some smaller plants may have all spikelets essentially sessile in the inflorescence.

Bulbostylis capillaris is superficially similar, but differs in its hair-like leaves, minute brown tubercle at the summit of the achene, and puberulent rounded scales. Fimbristylis autumnalis has flat leaves, lacks a persistent tubercle, and has glabrous acute to mucronate scales. Rhynchospora scirpoides is also similar, but differs from both in its 2-sided achenes with long persistent style, the base of which nearly or quite covers the summit of the achene, and its larger anthers (0.6–0.9 mm). The spikelets are generally thicker and darker, a useful impression for field recognition. Bulbostylis usually does not occur on the moist shores where F. autumnalis and Rhynchospora scirpoides are often growing together.


Alger County
Allegan County
Barry County
Berrien County
Cass County
Cheboygan County
Chippewa County
Clare County
Clinton County
Delta County
Emmet County
Grand Traverse County
Hillsdale County
Ingham County
Iosco County
Jackson County
Kalamazoo County
Kent County
Lake County
Lenawee County
Luce County
Mackinac County
Manistee County
Mason County
Midland County
Monroe County
Montcalm County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ottawa County
Roscommon County
Schoolcraft County
St. Clair County
St. Joseph County
Tuscola County
Van Buren County
Washtenaw County
Wayne County
Wexford County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. November 30, 2022.