*Hydrilla verticillata (Linnaeus f.) Royle. Hydrilla. Phen: Jun-Aug. Hab: Ponds, lakes, rivers, often locally abundant. Dist: Native of the Old World. This species has become a serious aquatic weed. Reported for SC by Nelson & Kelly (1997).

Origin/Endemic status: Eurasia

Synonymy: = Ar, C, ETx1, FNA22, GW1, K1, K3, K4, Meso6, NcTx, NE, NY, Pa, Tn, Va, WH3; = n/a – RAB

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