Callitriche heterophylla Pursh var. heterophylla . Common Water-starwort. Phen: Mar-Nov. Hab: Pools, slow-moving streams, ditches. Dist: Greenland west to AK, south to c. peninsular FL, TX, CA, and Mexico.

Origin/Endemic status: Native

Taxonomy Comments: The other variety, var. bolanderi (Hegelmann) Fassett, with larger fruits, co-occurs with var. heterophylla in nw. North America and is of uncertain taxonomic status, having been treated as species, subspecies, variety, and lumped.

Synonymy: = NE, Va, Lansdown (2009); = Callitriche heterophylla Pursh – Tat; = Callitriche heterophylla Pursh ssp. heterophylla – K1, K3, K4, NY; > Callitriche anceps Fernald – F, Fassett (1951); > Callitriche deflexa A.Braun var. austini (Engelm.) Hegelm. – F; < Callitriche heterophylla Pursh – Ar, C, Fl6, FNA17, G, GrPl, GW2, Il, Mi, NcTx, Pa, RAB, S, S13, Tn, Tx, W, WH3, Crow & Hellquist (2000a); > Callitriche heterophylla Pursh – F; > Callitriche heterophylla Pursh var. heterophylla – Fassett (1951)

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Wetland Indicator Status:

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

Heliophily: 7