Herbs, perennial, to 250 cm; rhizomes absent; stolons present; corms present. Leaves submersed and floating, sessile, phyllodial, flattened, 50--250 ´ 0.4--1.5 cm; rare stranded plants without expanded leaf blades. Inflorescences racemes, rarely panicles, of 4--10 whorls, floating to slightly emersed, 15--25 ´ 5--15 cm; peduncles to 200 cm; bracts connate less than or equal to total length, lanceolate, 0.4--0.8 mm, delicate, not papillose; fruiting pedicels spreading to recurved, cylindric, 1.5--4.5 cm. Flowers to 2.8 cm diam.; sepals erect to spreading in staminate, erect in pistillate, enclosing flower or fruiting head; filaments dilated, ± equaling anthers, glabrous; pistillate pedicellate, without ring of sterile stamens. Fruiting heads 0.7--1 cm diam.; achenes obovoid, abaxially keeled, 5 ´ 2.5 mm, beaked; faces not tuberculate, wings absent, glands 0--1; beak lateral, erect, 1 mm. 2n = 22.
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