found: Wiersma, J.H. World economic plants, 1999(Isatis tinctoria L., common names: dyer's woad, woad)
found: Britannica micro.(woad: also called dyerswoad (Isatis tinctoria) biennial or perennial herb of the mustard family (Brassicaceae), formerly grown as a source of the blue dye indigo and now sometimes cultivated for its clusters of small, four-petalled yellow flowers)
found: Hortus 3(Isatis tinctoria, Dyer's woad, Asp of Jerusalem, formerly grown for blue dye obtained from the leaves)
found: Wikipedia, Nov. 15, 2007(Woad (or glastum) is the common name of the flowering plant Isatis tinctoria in the family Brassicaceae. It is commonly called dyer's woad. It is occasinally known as Asp of Jerusalem. Woad is also the name of a blue dye produced from the plant.)
