Stems 70-80 cm tall, slender. Leaves dimorphic; sheathlike leaves 4-12 cm; linear leaves 40-45 cm × 1-2 mm, abaxially convex, transverse section semicircular. Male part of spikes 4-5 cm, without hairs on axis, with 1 deciduous bract at base; female part of spikes separated from male part, 2.5-4.5 cm, with a deciduous bract at base. Male flowers: stamen 1; anthers ca. 1.5 mm. Female flowers with bracteoles; ovary elliptic; styles ca. 0.6 mm; stigmas linear, ca. 0.8 mm; hairs on stalk ca. as long as styles. Fruit elliptic. Fl. and fr. May-Sep.
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