It is one of the common names for a plant. It is also known as St. Philip's Wort, Noiglo, Pastel Grass, Isatid, Jerusalem Asp. Indigo. Its scientific name is Isatis tinctoria and it belongs to the family Brassicaceae. It has medicinal uses (traditional Chinese medicine) and in dry cleaning. Dye blue.
Dye plant of the brassicaceae family with yellow flowers that are also called pastel, isatide, St. Philip's wort, asp of Jerusalem, isatis tinctoria, from whose leaves a dark blue tint was once obtained