Sagittaria latifolia is a perennial aquatic herb, monocotyledon, sap milky, rooted in mud, colonial from rhizomes with edible tubers.
Leaves all basal, 5-40 cm long, 1-25 cm wide, arrow-shaped to elliptic on same plant, very variable, often very narrow with long lobes at base, veins prominent, radiating from insertion of stem.
Flowers white; monoecious (usually), with 2-10 whorls of showy, 3-parted flowers, about 3 cm wide, staminate flowers above pistillate, 3 petals, stamens yellow, numerous; blooming July-Sept.; flowering stem to 1 m.
Fruit dry, a ball-shaped head of flat, asymmetrical winged achenes (1-seeded fruit), each about 0.3 cm long; wing is spongy (use lens), probably adapted for floating rather than wind dispersal (pers. obs.).
Wetland status: OBL.
Frequency in NYC: Infrequent.
Habitat: Open wet areas and sunny pond edges. Sometimes planted in wetland restorations and mitigations.