Persicaria amphibia (Linnaeus) Delarbre var. stipulacea (Coleman) Hara. Section: Persicaria. Common name: Water Smartweed. Phenology: Jun-Oct. Habitat: Marshes, wet disturbed areas. Distribution: NL (Newfoundland), NU, and AK south to NJ, DE, PA, CA, and Mexico.

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 ⓘ: = Can, Mi, Mo3; = Persicaria amphibia (L.) Delarbre ssp. laevimarginata (Hultén) Soják — NE, NY; = Persicaria muhlenbergii (S.Watson) Small — S; = Polygonum amphibium L. var. stipulaceum Coleman — C, F, Mitchell & Dean (1978); < Persicaria amphibia (L.) Delarbre — Ar, Fl4, FNA5, Il, K4, Mex, Pa, POWO, Tn, Va; < Persicaria emersa (Michx.) Small — S13; < Polygonum amphibium L. — W; < Polygonum coccineum Muhl. ex Willd. — G, RAB, Tat, Horton (1972). Basionym: Polygonum amphibium L. var. stipulaceum Coleman 1874

Links to other floras: < Persicaria amphibia - FNA5

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL (taxonomic split from wetland indicator species)
• Eastern Mountains and Piedmont: OBL (taxonomic split from wetland indicator species)
• Great Plains: OBL (taxonomic split from wetland indicator species)
• Midwest: OBL (taxonomic split from wetland indicator species)
• Northcentral & Northeast: OBL (taxonomic split from wetland indicator species)

Heliophily ⓘ: 8