Prairie Blue, a medium- late maturing oilseed flax (Linum usitatissimum L.), was released in 2003 by Agriculture and Agri-Food Canada, Morden Research Station, Morden, Manitoba. This cultivar has high oil content, high oil quality, small seed size, very good lodging resistance and high yield in all soil zones of the prairies. It is immune to current North American races of rust [Melampsora lini (Ehrenb.) Desmaz], and moderately resistant to wilt caused by Fusarium oxysporum Schlecht. f. sp. lini (Bolley) Snyder & Hansen. Key words: Flax, oilseed, Linum usitatissimum L., cultivar description