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Acid waters of bogs, ponds, ditches and streams.
Mainly along the coast from MA to FL and MS, inland to west central NY.
Herbaceous, aquatic perennial; leaves long-petiolate, the blade usually sagittate, the main portion mostly narrow, 4-10 cm long, (1-)2-many times as long as wide, with narrow, linear to lance-attenuate basal lobes; petioles rounded or with 2 blunt ridges on the lower side; scape 20-80 cm, with 2-4 whorls of flowers, the upper staminate, the lower pistillate; pedicels 0.5-3.5 cm, ascending in fruit; bracts herbaceous and relatively thick, 5-25 mm, mostly shorter than the pedicels; sepals 4-7 mm, reflexed in fruit; petals 8-12 mm; stamens 15-25, with slender glabrous filaments as long as or longer than the anthers; mature receptacle echinate; achenes 2.5-4 mm, with 1 or 2(-3) wings on each face, the wings extending onto the obliquely ascending, 1-2 mm long beak; achene faces with resin ducts.
Flowers August to September
Wetland indicator: OBL
This species is sometimes confused with S. latifolia which can have similarly narrow leaves but has achenes with beaks that spread at right angles to the body.
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
Michael Hough © 2018