*Persicaria hydropiper (Linnaeus) Delarbre. Section: Persicaria. Common Smartweed, Waterpepper, Marshpepper Smartweed. Phen: May-Dec. Hab: Wet pastures, barnyards, ditches. Dist: Native of Europe.

Origin/Endemic status: Europe

Synonymy: = Ar, FNA5, Il, K3, K4, Mi, NE, NY, Pa, S, Tn, Tx, Va; = Polygonum hydropiper L. – C, F, GW2, K1, RAB, W, Horton (1972); > Polygonum hydropiper L. var. hydropiper – WV; > Polygonum hydropiper L. var. projecta Stanford – WV

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