Eleocharis robbinsii Oakes
Common Name: SPIKE-RUSH
Coefficient of Conservatism: 8
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Sedge

Eleocharis robbinsii spike A. A. Reznicek spike

Sandy to peaty shores, lakes and ponds, bog pools; thriving (fruiting) on recently exposed shores.

The three angles of the culms may not be clearly seen in pressed specimens, which may nevertheless be identified by the combination of spikes scarcely thicker than the culm and the relatively slender culm. Numerous limp, hair-like culms are produced when the plant is growing in water; these are contrasted with the similar structures of Eleocharis acicularis, Juncus militaris, and Schoenoplectus subterminalis, with which this species may grow, in couplets 26–28 of Key A, to aquatic plants with all leaves floating or submersed.


Alger County
Allegan County
Barry County
Berrien County
Cass County
Cheboygan County
Clinton County
Emmet County
Ingham County
Kalamazoo County
Kent County
Keweenaw County
Lake County
Luce County
Manistee County
Muskegon County
Newaygo County
Presque Isle County
Roscommon County
Schoolcraft County
Van Buren County
Washtenaw County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 29, 2022. https://michiganflora.net/species.aspx?id=1120.