| General Information |
| Distribution | Native to Eurasia, northern Africa, and North America.In the Hawaiian Islands,
naturalized on
Kaua`i, O`ahu, Hawai`i.
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Habit
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Plants usually coarse and stout; stems 1-3 m long.
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Leaves
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Leaves 12-16 per vegetative stem, pale green, nearly flat, 8-20 mm wide, sheath open to base, the scarious upper margins tapering or rarely truncate.
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Flowers
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Staminate and pistillate spikes contiguous or occasionally separated by an interval up to 2.5 cm long; staminate spikes pale brown, the flowers with simple hairs, stamens on branched filaments, pollen yellow or occasionally orange, in tetrads; pistillate spikes dark brown, 10-18 cm long, 1.5-3 cm in diameter, flowers without scales or hairs, on slender, often hair-like, compound pedicels 1-2 mm long.
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Fruit
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Fruit ellipsoid, (0.9-)1.2-1.5(-1.6) mm long.
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Chromosomes
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2n = 30
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