Sagittaria chapmanii (J.G. Smith) C. Mohr. clade: Graminea Group, Graminea Complex. Chapman's Arrowhead. Phen: May-Sep. Hab: Limesink (doline) ponds with drawdown hydrology, mucky ditches. Dist: E. NC south to s. FL, west to e. LA. First reported for SC by Nelson & Kely (1997). reports from west of the Mississippi River are based on misidentifications of S. platyphylla.

Origin/Endemic status: Endemic

Taxonomy Comments: Analyses of allozyme variation in the S. graminea complex revealed great differentiation between S. graminea, S. chapmanii, and S. platyphylla; S. graminea and S. platyphylla appeared to be more closely related to one another than either was to S. chapmanii (Hauber & Legé 1999). Therefore, it seems best to treat these three taxa at equal rank and at the species level.

Synonymy ⓘ: = K3, K4, S, S13, Sorrie & LeBlond (2008); = n/a – RAB; = Sagittaria graminea Michx. ssp. chapmanii (J.G.Sm.) R.R.Haynes & Hellq. – FNA22, Keener (2005), Sorrie, Keener, & Edwards (2007); = Sagittaria graminea Michx. var. chapmani J.G.Sm. – Bogin (1955), orthographic variant; = Sagittaria graminea Michx. var. chapmanii J.G.Sm. – GW1, K1, SFla, WH3, Wooten (1973)

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL
• Great Plains: OBL

Heliophily ⓘ: 8