Sparganium angustifolium Michaux. Phen: Jun-Oct. Hab: Marshes. Dist: NL to AK, south to n. NJ, n. PA, MI, WI, MN, SD, NM, AZ, and CA; attributed to VA and WV by Kartesz (1999), apparently erroneously.
Origin/Endemic status: Native
Synonymy: = C, FNA22, K1, K3, K4, Mi, NE, NY, Pa, Cook & Nicholls (1986), Crow & Hellquist (2000b); > Sparganium angustifolium Michx. – F; > Sparganium multipedunculatum (Morong) Rydb. – F