Location
美国 Common in soft muddy soil of old oxbow in Pine River floodplain,ungrazed(for at least 30 years),with Carex lacustris,Carex spp.Mentha arvensis,Iris virginica,Lysimachia nummularia,surrounded by forest
Habitat
Wisconsin:Richland Co,3miles SE of Richland Center T10N;R1E,NE0.25NW0.25sec.35.