Herbs, perennial, to 50 cm; rhizomes coarse; stolons absent; corms absent. Leaves mostly submersed, rarely emersed, sessile, phyllodial, flattened to lenticular, 5--30 ´ 0.2--0.5 cm. Inflorescences racemes, of 2--5 whorls, emersed, 1.5--8 ´ 1--7 cm; peduncles 1--2.5 cm; bracts connate more than or equal to ¼ total length, lanceolate, 0.5--1.5 mm, delicate, not papillose; fruiting pedicels spreading, cylindric, 0.6--2.5 cm. Flowers to 2.5 cm diam.; sepals recurved to spreading, not enclosing flower or fruiting head; filaments dilated, shorter than anthers, minutely tomentose; pistillate pedicellate, without ring of sterile stamens. Fruiting heads 0.5 cm diam; achenes obovoid-triangular, abaxially keeled, 2 ´ 1 mm, beaked; faces tuberculate, wings 1, scalloped or toothed, glands 0--1; beak lateral, incurved-erect, 0.3 mm.
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