The Collaborative International Dictionary
Gratiola officinalis
Gratiolin \Gra*ti"o*lin\, n. (Chem.) One of the essential principles of the hedge hyssop ( Gratiola officinalis).
Wikipedia
Gratiola officinalis
Gratiola officinalis, the gratiole, common hedgehyssop or herb of grace, is an ornamental plant in the Plantaginaceae family. It is a rhizomatous perennial herb native to Europe.