Dig deeper at SERNEC, a consortium of southeastern herbaria.
This is an odd and somewhat "ugly" plant, looking more like a Myriophyllum or Proserpinaca than a species of Primulaceae somewhat related to Lysimachia! Read more at Vascular Plants of North Carolina.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Ericales
Manual of the Southeastern Flora (Small, 1933)