Rhizomes creeping, thick, ca. 1 cm in diam. Leaves grayish green, sword-shaped or broadly linear, 40--100 × 0.8--1.5 cm, midvein absent, base surrounded by maroon-brown fibers. Flowering stems 22--60 cm, solid; spathes 3--5, very unequal, 6--8 × 1--1.5 cm, 2--4-flowered, proximal ones shorter, apex usually acute, distal ones longer, apex usually obtuse. Flowers dark blue or violet, 9--10 cm in diam.; pedicel 1.5--3.5 cm. Perianth tube ca. 2 cm; outer segments obovate or elliptic, with a central, white or yellow zone, limb 7.5--9 × 4--4.5 cm; inner segments erect, oblanceolate, 5--6.5 × 0.8--1.5 cm. Stamens ca. 3 cm; anthers white. Ovary ca. 2 cm × 5--7 mm. Style branches 5--6 × ca. 1.2 cm; stigmas 2-lobed. Capsule ellipsoid-cylindric, 6.5--7 × 2--2.5 cm, apex not beaked. Seeds brown, semiorbicular, flat, ca. 6.5 × 5 mm. Fl. May--Jun, fr. Jul--Aug. 2 n = 32, 36*.
Can be grown by divisions or seedlings. Seeds needs stratification.
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