Stems emersed, erect, 20-50 cm tall. Leaves 30-56 cm, lower keeled or trigonous on abaxial side. Racemes 6-15 cm; male heads 1-3, not separate from female ones; female heads 3 or 4(-8), relatively near each other, lowest one pedunculate. Male flowers: perianth segments ca. 1.5 mm, serrate-lobate at apex; filaments 3-3.5 mm; anthers oblong, ca. 1 mm. Female flowers: perianth segments 2-2.5 mm, lobate at apex; ovary fusiform, with short stalk; styles short; stigmas ca. 0.5 mm. Fruit broadly fusiform, ca. 3 mm. Fl. and fr. Jun-Sep. 2n = 30.
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