Potamogeton nodosus Poiret. Longleaf Pondweed, American Pondweed. Phen: May-Sep. Hab: Ponds, lakes, streams, and rivers. Dist: ME and QC west to BC, south to Panhandle FL, TX, CA, Mexico, and Central America.

ID notes:The floating leaves of Potamogeton nodosus can be distinguished from P. natans by the presence of 9-21 veins (vs. 17-37 in P. natans).

Origin/Endemic status: Native

Synonymy: = AqW, Ar, C, ETx1, F, FNA22, G, GrPl, GW1, Il, K1, K3, K4, Mi, Mo1, NcTx, NE, NY, Pa, RAB, Tn, Tx, Va, W, WH3, WV, Z; > Potamogeton americanus Cham. & Schltdl. – S13, Tat; ? Potamogeton fluitans Roth – S; Potamogeton oblongifolium Forster, proposed for nomenclatural rejection (Reveal et al. 2003)

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL
• Eastern Mountains and Piedmont: OBL
• Great Plains: OBL
• Midwest: OBL
• Northcentral & Northeast: OBL

Heliophily: 8