Potamogeton vaseyi J. W. Robbins
Coefficient of Conservatism: 10
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb
Status: T

Michigan collections seen have all come from fairly small lakes at depths up to 4.6 m, except for specimens collected in the early 1900’s in “big ditches” near Algonac, St. Clair Co.

Vegetative plants without floating leaves closely resemble small plants of P. pusillus var. tenuissimus, but are generally more delicate, the winter-buds slender, elongate, long-attenuate and pointed. To be certain of identifications, ambiguous populations should be scanned for floating leaved plants in shallower water. Potamogeton lateralis (see Michigan Flora) has been found to be based on a mixed collection of P. vaseyi and P. pusillus (Hellquist, Philbrick, & Hilton 1988). We have not re-examined the single Michigan collection reported as P. lateralis.


Chippewa County
Gogebic County
Houghton County
Iron County
Kalamazoo County
Kent County
Keweenaw County
Marquette County
Oakland County
Ontonagon County
St. Clair 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=2343.