Celandine poppy

Celandine poppy, Stylophorum diphyllum, is a native woodlands perennial of the poppy family that is found in a few counties in Illinois, including Cook County, and is threatened by the invasive garlic mustard. It produces inch-long, hairy seed pods and small, attractive, delicate yellow flowers in mid-summer. It is said to colonize well and can be used as a ground cover. I tried introducing some in the hot, dry summer of 2012 in a spot that ends up bare in late summer after earlier bloomers die back, and it seemed to do well at the base of a tree in a relatively moist, shady area, and came back in 2013.