Rhizomes creeping, thick. Leaves linear, 30--80 cm × 5--12 mm, midvein distinct on both surfaces, apex acuminate. Flowering stems 25--100 cm, solid, 1--3-leaved; spathes 3, lanceolate, unequal, 4.5--7.5 × 0.8--1.2 cm, leathery, 2-flowered, veins distinct, raised, basal spathe shorter, apex usually acute, apical spathe longer, apex usually obtuse. Flowers dark reddish purple, 9--10 cm in diam.; pedicel 1.5--3.5 cm. Perianth tube 1.5--2 cm; outer segments obovate, mottled yellow at center, 7--8.5 × 3--3.5 cm; inner segments erect, narrowly lanceolate, ca. 5 cm × 5--6 mm. Stamens ca. 3.5 cm; anthers purple. Ovary cylindric, 1.5--2 cm × ca. 3 mm. Style branches purple, ca. 5 cm × 7--10 mm. Capsule ellipsoid, 4.5--5.5 × 1.5--1.8 cm, 6-ribbed, apex shortly beaked. Seeds maroon-brown, semiorbicular, flat. Fl. Jun--Jul, fr. Aug--Sep. 2 n = 24*.
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A perennial plant. It grows 30-90 cm high and 30-45 cm wide. It has a creeping rhizome. The leaves are narrow and 30-80 cm long by 5-12 mm wide. The flowering stems are 25-100 m long. The flowers are purple and beardless. Colours can vary from white, blue, pink and purple.
Can be grown by divisions or seedlings. Seeds needs stratification.
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