Locality:
United States, Wisconsin, Dodge, Township of Williamstown; On the Horicon Marsh Wildlife Area
43.4657272 -88.6110556
Verbatim Coordinates:
43.4657272° N, 88.6110556° W; T12N R16E sec32
Habitat:
Collected from a new impoundment, anchored in 8 inches of water with several other members and also with Carex spp., Typha spp., and Sparganium spp. No water flow, partially exposed and in rich organic marsh sediments.
Occurrence Remarks:
[Polygonum amphibium L. var. stipulaceum N.Coleman]