" He opened his hand, and inside was a tiny lavender-colored flower with a small stem.
"Well, well, well. Look what we have here. Mr. Exley left us a present. Cichorium intybus. Chicory. The plant of freedom and one of the nine plants. He used it to get out of the basement, and then he left us a cutting as a courtesy. Your Mr. Exley has a good sense of humor."
"He's not my Mr. Exley."
"Unimportant. This little petal tells us how he got out of here."
"He broke a deadbolt with a flower petal?"
"In a sense, yes. Cichorium intybus is a perennial related to the dandelion. It's cultivated in England and Ireland and from Nova Scotia to Florida and west to the plains. It is not cultivated here, in South America. He brought it with him!"
"For what?"
"For its magical properties. The plant has a long, thick taproot filled with a bitter milky-white juice. The ancient Egyptians believed that if the juice is rubbed on the body it promotes invisibility, and removal of obstacles. The Mayans called it the plant of freedom, for the same reason. "

― Margot Berwin , Hothouse Flower and the Nine Plants of Desire