Lesser celandine (Ranunculus ficaria), also known as fig buttercup or pilewort, is a perennial, herbaceous flowering plant native to Europe, North Africa, Western Asia, and Siberia. It was introduced to the United States as an ornamental and, despite its invasive tendencies in 17 states, many colorful varieties are still widely available commercially. In Indiana, lesser celandine has been reported in Hendricks, Lake, Marion, Monroe, and Wayne Counties.
More . . .
Purdue Plant and Pest Diagnostic Laboratory
For more resources check out the following publications: Shrubs of Indiana and Woody Vines of Indiana and the Midwest