Arumleaf arrowhead is a widespread North American native.
Identification: Arumleaf arrowhead has arrowhead-shaped leaves
1¾-6″ (5-15 cm) long, on stalks that are triangular in cross-section. In addition to arrow-shaped leaves
that are mostly above the water line, arumleaf arrowhead may have floating or submersed leaves that
are long and narrow, and floating leaves that are oval- or heart-shaped.
Flowers are white, with yellow centers.
Each flower has three petals and three green sepals, and is up to ⅞″ (2.5 cm) in diameter.
Fruits are about 1/16″ (2 mm) long, clustered on spherical heads.
9/7/2010 · Tower Hill Botanic Garden, Boylston, Massachusetts · ≈ 8 × 12″ (20 × 31 cm) ID is uncertain
6/2/2010 · J. Harry Rich State Forest, Groton, Massachusetts · ≈ 1 × 2′ (41 × 62 cm) ID is uncertain
Arumleaf arrowhead is easily confused with broadleaf arrowhead:
Each flower has three white petals with yellow centers, and three green sepals; flowers are ⅜-¾″ (1-2 cm) in diameter. Flower stalks held upward, not outward.
Each flower has three white petals with yellow centers, and three green sepals; flowers are 1½″ (4 cm) in diameter. Flower stalks held outward, not upward.
Leaves
Leaves are 1¾-6″ (5-15 cm) long. May also have floating or submersed leaves that are long and narrow, and floating leaves that are oval- or heart-shaped.
5/5/2010 · Nashua River at Rte 119, Groton, Massachusetts · ≈ 1 × 2′ (41 × 62 cm) ID is uncertain
8/8/2010 · Jeff Smith Trail, Beaver Brook Association Conservation Lands, Rte. 130, Hollis, New Hampshire · ≈ 7 × 10″ (16 × 25 cm) ID is uncertain
Sagittaria arifolia Nutt.exJ.G.Sm.
Sagittaria cuneata description by Thomas H. Kent, last updated 25 May 2020.
8/8/2010 · Jeff Smith Trail, Beaver Brook Association Conservation Lands, Rte. 130, Hollis, New Hampshire · ≈ 3 × 4½″ (7.5 × 11 cm) ID is uncertain
8/28/2010 · Lake Messalonskee, Belgrade Lake, Maine · By Constance B. Kent ID is uncertain