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Antheridia in an oval or obcordate disk immersed in the apex of the thallus.

Thallus linear-obcuneate, 3–6´´ long, 1–2´´ wide, 2-lobed at the apex, pale green with usually distinct whitish pores, the scales beneath often extending far beyond the margin and becoming whitish; peduncle profusely chaffy at base and apex, sometimes much reduced; antheridial disks obcordate.

Scape 2–6´ high; leaves spatulate or wedge-oblong, thin and veiny, not mealy; involucre 1–8-flowered; lobes of the flesh-colored corolla broadly and deeply obcordate.—Wet banks and shores, northern N. Eng. and N. Y. to L. Superior, and northward.

Stem 1–3° high; leaves flat, carinate; raceme simple or sparingly branched and few-flowered; bracts ovate-lanceolate; base of the perianth coherent with the base of the ovary, the thin ovate or obovate sepals marked with a large obcordate gland, the inner abruptly contracted to a broad claw.

Pod several-seeded, obovate or obcordate, winged.