Perennial flax (Linum perenne) also blue flax is a flowering plant in the family Linaceae, native to Europe, It is a slender herbaceous perennial plant growing to 60 cm tall, with spirally arranged narrow lanceolate leaves 1–2.5 cm long. The flowers are pale blue, 2–2.5 cm diameter, with five petals. Nr Monte St Angelo, Gargano, Puglia, Italy April 2018