Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Closely resembles Elodea, but has leaves in whorls of 5+ (vs. 3) and flowers have 3 bright white petals. Closely resembles the federal noxious weed Hydrilla but leaves have extremely slender marginal prickles and lack prickles along midvein beneath. Read more at Vascular Plants of North Carolina.
Spermatophytes (seed plants): Angiosperms (flowering plants): Monocots: Alismatales
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Manual of the Southeastern Flora (Small, 1933)
Brazilian Waterweed, Brazilian Egeria, "Brazilian Elodea", "Anacharis"
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JK Marlow jkm160914_140
SE-EPPC Aquatic Plant ID Workshop
This is the "Elodea" or "Anacharis" of the aquarium trade, per Weakley's Flora (2012).