Polygonum buxiforme Small. Small's Knotweed. Phen: Jun-Oct. Hab: Bottomlands, swamps, marshes, also disturbed areas, roadsides. Dist: NL (Newfoundland), NL (Labrador), NU, and NT, variously reported south to SC, AL, MS, LA, TX, and CA.

Origin/Endemic status: Native

Synonymy: = C, GrPl, Il, K1, Mi, NE, NY, S, Tx, Mitchell & Dean (1978); = Polygonum aviculare L. ssp. buxiforme (Small) Costea & Tardif – Ar, FNA5, K3, K4, Costea & Tardif (2003a); < Polygonum aviculare L. – G, Pa, RAB, Tn; =? Polygonum aviculare L. var. littorale (Link) Mert. – F, misapplied; ? Polygonum littorale Link – S13, misapplied

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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)

Heliophily: 7