The leaves of blue flax are thin and many, arranged in linear spiral shape, alternate, narrow or strip lanceolate, about 8 to 25 mm long, about 3 to 8 mm wide, the whole leaf is involute, the apex is sharp, and the base is gradually narrow.
The leaves are oblanceolate, 1.5 to 11 cm long and 6 to 13 mm wide.
Blue flax flowers are mostly, forming cymose inflorescences. The flowers are blue, blue purple and light blue. The diameter of the flowers is about 2cm. The pedicels are long and thin, about 1 to 2.5cm long. The flowers are upright or curved to one side. The petals are usually 5, in obovate shape, 1 to 1.8cm long, with round top and wedge-shaped base.
It has umbels of 3 to 10 flowers, 2 to 11 mm long pedicels, strips of oblanceolate petals, about 6 to 13 mm long and 2 to 3 mm wide.
