Herbs, perennial, to 65 cm; rhizomes absent; stolons present; corms present. Leaves emersed or submersed, phyllodial or rarely dilated apically, flattened, 4--40 cm ´ 0.05--0.4(--0.5) cm. Inflorescences racemes, of 1--5 whorls, emersed, 2--20 ´ 1.5--12 cm; peduncles 7--59 cm; bracts connate more than or equal to ¼ total length, oblanceolate, 0.2--0.3 mm, delicate, not papillose; fruiting pedicels spreading, cylindric, 0.5--6 cm. Flowers to 1.3 cm diam.; sepals recurved to spreading, not enclosing flower; filaments dilated, shorter than anthers, minutely tomentose; pistillate pedicellate, without ring of sterile stamens. Fruiting heads 0.5--1 cm diam.; achenes obovoid, abaxially keeled, 2.2--2.8 ´ 1.5--2 mm, beaked; faces not tuberculate, wings 1--2, ± entire, glands 3--5; beak lateral, incurved-erect, 0.2 mm.
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