Myriophyllum heterophyllum Michaux. Subgenus: Brachytheca. Section: Tessaronia. Subsection: Spondylastrum. Southern Water-milfoil. Phen: Apr-Oct. Hab: Ditches, slow-moving waters of rivers and streams, pools, ponds, springs. Dist: NY west to ON and MN, south to FL, TX, and Mexico.

Origin/Endemic status: Native

Synonymy: = Ar, C, F, Fl2, FNA10, G, GrPl, GW2, Il, K1, K3, K4, Meso4.1, Mex, Mi, NcTx, NE, NY, Pa, RAB, S, S13, Tat, Tn, Tx, Va, WH3, WV, Aiken (1981), Crow & Hellquist (2000a), Moody & Les (2010)

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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: 9