Tufted herb. Leaves linear-ensiform, 8-55 cm long, 2-10 mm wide, flat, finely veined, glabrous; margins glabrous or brown-pubescent. Scape 10-80 cm long, glabrous, clasped by 1 reduced leaf. Spathes elliptic to lanceolate, 3-5 cm long, glabrous or puberulous on keel, brown; margin c. 1 mm wide, scarious, brown-streaked. Involucre 7-18 mm wide; inner bracts slightly exserted. Tube 2.5-4 cm long, villous. Sepals ovate, obtuse, 2-3.5 cm long, 1.2-2.2 cm wide, blue-violet. Petals lanceolate. Filaments 4-7 mm long, almost completely connate. Ovary villous. Capsule cylindrical, 1.8-2.5 cm long. Seeds compressed-ovoid, 2-3 mm long, dark brown; aril absent.
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