Linum perenne, the perennial flax,[2] blue flax or lint, is a flowering plant in the family Linaceae, native to Europe, primarily in the Alps and locally in England.

[3] It is a slender herbaceous perennial plant growing to 90 centimetres (3 ft) tall from a fairly woody root crown, with tough, unbranched stems,[3] and many spirally arranged narrow lanceolate leaves 1–2.5 cm long.

anglicum and high altitude populations in the Alps as Linum perenne subsp.

The similar western North American species Linum lewisii is sometimes treated as a subspecies of L. perenne.

Native Americans used the stems to make fishing line and nets.