Linum perenne

Linum perenne, the perennial flax, blue flax or lint, is a flowering plant in the family Linaceae, native to Europe, primarily in the Alps and locally in England.
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.
The English populations are sometimes distinguished as "Linum perenne" subsp. "anglicum" and high altitude populations in the Alps as "Linum perenne" subsp. "alpinum". The similar western North American species "Linum lewisii" is sometimes treated as a subspecies of "L. perenne".
Cultivation.
Cultivars for garden use include 'Blue Sapphire'.