Petioles 3-7 cm, flat, glabrous, lf-blades linear, 2-5 cm נ2 mm; stipules 5 mm, adnate, marginally fimbriate; scape glabrous, 6-13 cm, with 1-4 fls 6-8 mm wide; sep minutely glandular-denticulate, 4-5 mm; pet white, obovate, 6 mm; seeds black, oblong-obovoid, rhomboidal, 0.5-0.8 mm, densely and irregularly crateriform-pitted; 2n=20. Bogs and wet shores, especially in calcareous sites; se. Can., s. to Me., Mich., Wis., and Minn., and w. irregularly through s. Can. to B.C. and nw. Mont. July-Aug.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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