A. A. Reznicek

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Small ponds and lakes, marsh borders.

A very distinctive species when fertile, but vegetative specimens may be impossible to separate from M. heterophyllum unless turions are present late in the summer (or old turion leaves are at the base). Fruiting material is known from all counties mapped, except for Houghton, from which vegetative material is referred here on the basis of very slender stem and extremely delicate foliage with minute dark spicules where lateral segments of the leaves meet the rachis. These seem almost always to be present in this species (at least on some leaves), but they are usually lacking in M. heterophyllum.

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