Rhizome apparently simple; roots fibrous with distal tubers 1-1.5 cm long. Leaves 15-65 cm long; lamina 3-10 mm wide, ascending to arching; sheath sometimes persisting as fibres. Inflorescence 25-60 cm tall; axis ±slender, few-to several-branched; lower bracts to 35 cm long; clusters 1-4-flowered, often paired, the lowest subtended by ovate-attenuate bracts to 7 mm long; upper bracts ovate-acuminate, down to 2 mm long; pedicels slender, 5-10 mm long. Perianth segments ±narrowly oblong, 4-7 mm long, white, blue or purple. Stamens 3.5-5 mm long; anthers less than 1 mm long; filaments narrowly fusiform, whitish. Capsule ±3-lobed, 2.5-5 mm wide. Seed 1.3-1.7 mm wide; testa minutely striate-aculeate or striate-tuberculate, shiny.
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