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Key to Triglochin

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1 Pistils 6, all fertile; fruits 2-4.5 mm long; central axis between the carpels not winged; [of NJ northward]
1 Pistils 6, 3 fertile and 3 sterile; fruits either 1.0-2.0 mm OR 7.0-8.3 mm long; central axis between the carpels broadly winged.
  2 Fruits 7.0-8.3 mm long, elongate in shape, 4-7× longer than the diameter; [of nw. PA, s. OH, c. IN, and nc. IL northwards]
  2 Fruits 1.0-2.0 mm long, globose in shape, 0.7-1.2× longer than the diameter; [of DE and MD southward]