Rhizome branched; roots tuberous, elongated. Leaves 10-55 cm long; lamina 1-5 mm wide, involute, ascending to arching; sheath papery. Inflorescence to 65 cm tall; axis becoming stout, simple or 1-4-branched; lower bracts to 45 cm long; clusters 1-3-flowered, the lowest subtended by ovate-attenuate bracts to 7 mm long; upper bracts ±triangular-acuminate, down to 2 mm long; pedicels slender, to 7 mm long. Perianth segments narrowly elliptic, 6-9 mm long, white, usually brown abaxially. Stamens 4.5-5 mm long; anthers 0.8-1.1 mm long; filaments slender, flattened, pale green. Capsule strongly 3-lobed, 4.5-8 mm wide. Seed 1.5-2.6 mm wide; testa smooth or areolate-alveolate, very shiny.