Plant caespitose. Leaves flat, with distinct marginal bands, 20-60 cm long, 4-5 mm wide, glabrous; apex broadly acute to rounded-truncate; sheath margins intact, white to straw-coloured. Inflorescence much longer than leaves; scape conspicuous, longer than rachis. Male inflorescence usually with l to several branches; branches and flowers in whorls up to 2 cm apart. Female inflorescence often unbranched; flower whorls closer. Bracts broad, shortly 1-several-pointed, much shorter than pedicel; inner bract present or absent. Flowers dark purple-black or rarely yellow or partly yellow. Male flowers 3-4 mm long; sepals and petals similar, spreading; pedicel 5-10 mm long. Female flowers similar but sessile.
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