Potamogeton spirillus Tuck.
Common Name: PONDWEED
Coefficient of Conservatism: 8
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Potamogeton spirillus float/submersed, fruit G. E. Crow float/submersed, fruit

Usually in shallow water: lakes, ponds, wet swales, and rarely quiet river borders.

The submersed leaves are often curved, giving the whole bushy plant the aspect of a broad-leaved Najas. The cellular-reticulate border of the midrib may occupy most of the area of the leaf. The few-flowered nearly spherical spikes are sessile or nearly so in the axils of submersed leaves, with the inflorescences in axils of floating leaves, when developed, being lonfger and borne above the water surface.


Alger County
Baraga County
Cheboygan County
Chippewa County
Gogebic County
Houghton County
Iron County
Keweenaw County
    Including Isle Royale
Luce County
Marquette County
Ontonagon County
Wexford County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. November 29, 2022. https://michiganflora.net/species.aspx?id=2341.