Perennial herb, 80–140 cm tall, growing from corms. Stem unbranched. Leaves 5–7, the lower 4–5 basal and longest, 6–9 mm wide, narrowly lanceolate. Flowers 6–15, bright-red with yellow markings on the lower tepals and in the throat; tepals very unequal, the uppermost 35-42 mm long, larger and much longer than the others.