Sagittaria engelmanniana (Engelmann's arrowhead or acid-water arrowhead) is a perennial aquatic plant growing up to tall. The leaves are sagittate (arrow-shaped) with 3 very narrow lobes.Smith, Jared Gage. 1894. Memoirs of the Torrey Botanical Club 5(3): 25, Sagittaria engelmanniana
The species is native to eastern North America. It has been reported from every state bordering on the Gulf of Mexico or on the Atlantic Ocean from Mississippi to Massachusetts, plus Vermont and Ontario.Biota of North America Program map, Sagittaria engelmanniana It occurs in wetlands, predominantly those with acidic water such as Sphagnum bogs.
References
External links line drawing at Missouri Botanical Garden, iconospecimen of Sagittaria engelmanniana Go Botany, New England Wildflower Society Sagittaria engelmanniana Connecticut Botanical Society, Engelmann's Arrowhead (Acid-water Arrowhead), Sagittaria engelmanniana