Sagittaria latifolia common arrowhead; duck potato Alismataceae SALA; Bx, bz, pb, sf (planted); Q, a, cu, j; K, p; R, cr, lp, w;

 

Sagittaria latifolia.Elaine Haug @ USDA-NRCS PLANTS Database

Sagittaria latifolia.Elaine Haug @ USDA-NRCS PLANTS Database (Accessed 4/2014).

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. 

Origin: Native. 

Habitat: Open wet areas and sunny pond edges. Sometimes planted in wetland restorations and mitigations.