*Polygonum aviculare Linnaeus ssp. neglectum (Besser) Arcangeli. Needle-leaf Knotweed. Phen: Jun-Nov. Hab: Fields, disturbed areas. Dist: Native of Europe. Documented from scattered locations in s. PA (Rhoads & Klein 1993); DE, NJ, and MD (Kartesz 1999); and WV (as P. aviculare ssp. rurivagum) (Costea & Tardif 2003).

Origin/Endemic status: Europe

Synonymy: = FNA5, K3, K4, NE, NY; = Polygonum neglectum Besser – GrPl, Il, Tat; < Polygonum aviculare L. – C, G, NcTx, Pa, RAB, Tn, WH3; ? Polygonum aviculare L. var. angustissimum Meisn.; < Polygonum aviculare L. var. aviculare – F; ? Polygonum bellardii All. – K1; > Polygonum franktonii S.J.Wolf & McNeill

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Wetland Indicator Status:

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