Stems emersed, erect, 33-57 cm tall. Leaves erect, 50-70 cm × 4-5 mm, upper flattened, lower keeled or trigonous on abaxial side. Panicles 7-16 cm, with 1 lateral branch at base, main axis and lateral branch usually zigzag; main axis with 5-8 male heads and 2 or 3 female heads; lateral branch with 3(-5) male and 1 female heads. Male flowers: perianth segments ca. 1.5 × 0.2 mm; filaments 3-4 mm; anthers oblong, ca. 1 × 0.2 mm. Female flowers: perianth segments 1.7-2.5 × ca. 1 mm, serrate-lobate at apex; ovary sessile; styles 1-1.5 mm; stigmas linear, 1-1.2 mm. Fl. and fr. Jun-Sep.
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