Persicaria amphibia (Linnaeus) Delarbre ssp. laevimarginata (Hultén) Soják. Section: Persicaria. Water Smartweed. Phen: Jun-Oct. Hab: Marshes, wet disturbed areas. Dist: NL (Newfoundland), NU, and AK south to SC, TN, TX, and CA, and southward into the New World tropics.

Origin/Endemic status: Native

Taxonomy Comments: See Haines (2011) for rather compelling comments for the recognition of several taxa in the P. amphibia complex.

Synonymy: = NE, NY; = Polygonum amphibium L. var. stipulaceum Coleman – C, F, K1, Mitchell & Dean (1978); < Persicaria amphibia (L.) Delarbre – Ar, Fl4, FNA5, Il, K3, K4, Mex, Pa, Tn, Va; > Persicaria amphibia (L.) Delarbre var. stipulacea (Coleman) Hara – Mi; ? Persicaria muhlenbergii (S.Watson) Small – S; < Polygonum amphibium L. – W; < Polygonum coccineum Muhl. ex Willd. – G, RAB, Horton (1972)

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