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Plants 3–16 cm, wholly glabrous; blade and sporophore ± erect in bud; blade supramedial or more often inframedial, on a 5–20 mm stalk, mostly 1–2(–4) × 0.5–1.5(–3) cm, often not reaching the base of the sporophore, simple or more often with (1)2–3(4) pairs of subopposite pinnae, these mostly obovate, basally cuneate, rounded above, entire or sometimes lobulate or the basal ones even somewhat pinnatifid, the basal pair larger than the next pair above at least in well developed plants; upper pinnae tending to be confluent; 2n=90. Open, marshy places, meadows, and edges of woodland ponds; circumboreal, s. to N.H., Pa., Io., and Calif. May, June. Ours is var. simplex.
