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Much like no. 3 [Callitriche palustris L.], differing mainly in the frs, these ca 1 mm or a little less, nearly to fully as long as wide (not more than 0.1 mm longer than wide), often but not always a little wider above the middle than below, the margins rounded or obtuse or very shallowly and inconspicuously grooved between the carpels, not at all sharp-edged or winged; pit-like markings on the surface of the fr not obviously aligned in vertical rows. In quiet water throughout most of N. Amer., and also in S. Amer. (C. anceps Fernald, the rare, mainly boreal, wholly submersed phase)
