Plants 200-500 mm high, often in small tufts. Stem flattened, elliptic in section, 2-winged, often broadly so in lower half, usually unbranched, bearing (2)4 to 7 sessile lateral flower clusters. Leaves narrowly sword-shaped, 4-7 mm wide, relatively soft-textured, margins angular, translucent, hyaline when dry. Flower clusters several, each (2)4-flowered; spathes greenish with translucent margins, 33-45 mm long, bracts dry-membranous, shorter than spathes. Flowers half to fully nodding, on pedicels 3-5 mm long, white or pale blue, with linear or V-shaped purple markings at tepal bases; tepals 28-35 mm long, inner slightly larger than outer. Filaments usually 22-26 mm long (rarely half as long); anthers 4.5-6.3 mm long. Ovary elongate, 3-lobed, 12-15 mm long; style 30-35 mm long, stigma lobes spreading, deeply fringed. Capsules elongate, ± woody, tardily dehiscent, deeply 3-lobed, 30-50 mm long. Seeds triangular-columnar, many per locule in a single row.
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Rhizomatous perennial, 20-50 cm, often in small clumps, stems flattened and 2-winged, usually unbranched, lateral flower clusters sessile. Leaves fairly broad, soft. Flowers secund, white or pale blue, stamens and style long, spathes green with hyaline margins. Capsules elongate.
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