They lay eggs, one in a place, upon the leaves of plantain, figwort, gerardia, and related plants generally near the tip of the leaves.
"Butterflies Worth Knowing"
Clarence M. Weed
603 figwort .
"Herbal Simples Approved for Modern Uses of Cure"
William Thomas Fernie
And the figwort is so named in allusion to its curative virtues against piles, when the plant is made into an ointment for outward use, and when the tincture is taken internally.
"Herbal Simples Approved for Modern Uses of Cure"
William Thomas Fernie