Perennial 1–4 dm, simple or branched above; stems slender, densely short-bearded at the nodes, otherwise glabrous or nearly so; lvs in 4’s, soon recurved or deflexed, linear-oblanceolate, 8–15 × 1–2.5(–3) mm, hispidulous on the margins, usually smooth on the midrib; infls few, mostly terminal, 3-fld, 3–10 mm; cor white, 2–3 mm wide, 4-lobed, the lobes longer than wide; fr smooth, 2–3 mm, usually both mericarps developed; 2n=24. Cold bogs, swamps, and wet thickets; Nf. and Lab. to the Mackenzie R., s. to Mass., N.Y., N.J., Ind. and Io. June, July.
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