Arisaema triphyllum - Jack-in-the-Pulpit
Jack-in-the-Pulpit is a charming woodsy perennial with REALLY strange flowers. In the spring it sends up a 4 foot stalk that unfurls a single leaf, then blooms a flower that looks like it's from outer space - lime green with white or purple stripes.
It looks like it eat flies or harbors pixies. (It does eat flies.) This woodland oddity is a particular favorite of children. Tell them not to eat it.
Arisaemas need moist rich soil and dappled shade. The unusual foliage is cool next to ferns and delicate woodland flowers. Clusters of shiny red berries appear in late summer, very showy. Then it goes dormant.
Each autumn, as the flower and leaf buds form for the next spring, the plant decides whether to be male or female, and may change it's sex every year.
Jack-in-the-Pulpit is perennial in zones 3 to 9. Seeds need stratification. Plant them outdoors in fall and they'll sprout in spring, otherwise, col stratify for 30 days in the fridge.