Polygonum glaucum Nuttall. Seabeach Knotweed, Seaside Knotweed. Phen: May-Oct; Jun-Nov. Hab: Ocean beaches, sound-side sandy shores, dune bases. Dist: Along the coast, MA south to ne. FL; also in Panhandle FL and s. AL (perhaps not native on the Gulf Coast).

Origin/Endemic status: Native

Synonymy: = C, F, Fl4, FNA5, K1, K3, K4, NE, NY, RAB, S, Tat, Va, WH3, Horton (1972), Mitchell & Dean (1978); = Polygonum maritimum L. – S13, misapplied

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACU
• Northcentral & Northeast: FACU

Heliophily: 9