Publication: Sp. Pl. 2: 670. 1753.
Origin: Introduced from Eurasia
selected vouchers: Not at WTU; WS?
Notes: This species has neither been collected nor photographed in Washington. It is not considered established here. FNA7: "Isatis tinctoria has been cultivated since ancient times as a source of a blue dye (woad) obtained by fermenting the ground leaves and proximal portions of the plant."