B. Gajewski

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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.

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