Dutchman's breeches.

Picture courtesy of Michael J. Von Gebel

I rescued this plant along with some others from an area slated to be bulldozed to make way for a new housing development .  They seem to thrive well in my garden.

Dutchman’s-breeches, are a plant from the poppy family named for its sprays of tremulous, yellow-tipped white flowers that fancifully resemble the wide-legged, traditional pantaloons worn by Dutch men. The plant is native throughout the eastern and midwestern United States usually in open woodlands. The gray-green foliage grows from white underground tubers and is not as tall as the flowering stalk. It grows best in shady gardens, preferably in a wind-free location.