Rhizome thick, plant 60-120 cm tall. Leaves 30-40 cm long, 2.0-4.5 cm broad, ensiform, glaucous. Peduncle (stem) up to 100 cm long, up to 3 branches with 4-5 flowers. Bract and bracteoles up to 5 cm long, scarious in upper half, often purplish. Perianth lavender, violet or bluish with brownish veins in lower parts; tube 2-2.5 cm; falls 7-9 ´ 4-5 cm, obovate-cuneate at base; beard white or pale blue; standard 7-9 ´ 4-5 cm, obovate or elliptic with a narrow claw at the base. Filament c. 1.8 cm long, pale-purple, anther white, subequal. pedicel short, ovary c. 1.6 cm long, style branches 4-4.5 ´ 1.5 cm, lobes obtuse 1-1.5 ´ 0.6-1 cm. Capsule 3-5 cm, ellipsoid, rare. Seeds pyriform, wrinkled, acute.