All round the chapel, the bare chalk is at this time tinged with a beautiful glow, from the blue flowers of the Viola Rothomagensis: the isatis Tinctoria, the true Woad, is also common on the steep sides of the cliff.
"Account of a Tour in Normandy, Vol. II. (of 2)"
Dawson Turner
This plant, known as isatis tinctoria, is still grown in France and Flanders.
"Beric the Briton A Story of the Roman Invasion"
G. A. Henty
When the fragrant berry became more and more scarce, chicory was discovered by good patriots to be a palatable substitute, and scientific men sought to induce French manufacturers to use the isatis plant instead of indigo.
"The Life of Napoleon I (Volumes, 1 and 2)"
John Holland Rose