Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Water Chickweed has the gestalt of a giant Common Chickweed (Stellaria media). Read more at Vascular Plants of North Carolina.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Caryophyllales
Manual of the Southeastern Flora (Small, 1933)
Water-chickweed, Giant Chickweed, Water Mouse-ear