Jack-in-the-Pulpit, Arisaema triphyllum, is a three-leaved woodland plant found native in all Illinois counties. It thrives in dense, shady, moist areas with acidic soil such as found under trees; fallen leaves covering the ground in winter help this plant return in spring.

For more about Jack-in-the-Pulpit and native plants for the Midwest, especially those that do well in shade/moist areas, see the "book" on this website, Gardening with Native Plants in Shady Evanston.