Sagittaria platyphylla (Engelmann) J.G. Smith. clade: Graminea Group, Platyphylla Complex. Phen: Jun-Sep (-Oct). Hab: Marshes, ditches, farm ponds, pondcypress wetlands, canals. Dist: VA, OH, IL, MO, and OK, south to FL, TX, and Mexico. The distribution of this species is primarily in the Mississippi drainage; occurrences east of the Appalachians may be introduced, either by humans or by waterfowl. First reported for VA by Wieboldt et al. (1998). Reported for c. FL (Orange County) by Dalager (2022, who considers it as introduced there and likely via the aquatic plant industry.
Origin/Endemic status: Native
Synonymy: = Ar, ETx1, F, FNA22, Il, K1, K3, K4, Meso6, Mo1, NcTx, Ok, Tx, Va, WH3, Keener (2005), Sorrie, Keener, & Edwards (2007), Wooten (1973); = n/a – Pa; = Sagittaria graminea Michx. var. platyphylla Engelm. – G, GrPl, RAB, Bogin (1955); < Sagittaria graminea Michx. var. graminea – C; > Sagittaria mohrii J.G.Sm. – S; > Sagittaria platyphylla (Engelm.) J.G.Sm. – S