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Marshes, ponds, stream, in mucky soil.
Nova Scotia and eastern Quebec to PA, west to southern British Columbia, MO, NM, and CA.
Herbaceous perennial from a 1-2 cm thick rhizome; leaves usually long-petiolate, the blade elliptic to broadly ovate, rounded to subcordate at the base, 3-18 cm long and 1.5-2.5 times as long as wide; scape 10-100 cm; pedicels in whorls of 3-10; sepals obtuse, 2-3 mm; petals white, 3.8-4.5 mm long, 1.5 times as long as the sepals; style short, 0.4-0.6 mm, the stigmatic portion more or less curved; achenes 15-23, 1.8-3.0 mm, usually with a median dorsal groove, rarely with 2 grooves.
Flowers June to September
Wetland Indicator: OBL
Similar to A. subcordatum but with larger petals that exceed the sepals and also larger achenes.
Gleason, Henry A.
and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States
and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY
USDA, NRCS. 2002.
The PLANTS Database, Version 3.5 (http://plants.usda.gov).
National Plant Data Center, Baton Rouge, LA 70874-4490 USA
© Michael Hough 2018