Smooth Meadow Parsnip, a native species, has been added to the USWildflowers database (12/28/2015.) Scientific name is Thaspium trifoliatum.  Photo below was taken in the Great Smoky Mountains National Park, Sevier County, TN on May 5, 2015. Go to the Smooth Meadow Parsnip detail page for more information.

Smooth Meadow Parsnip – Thaspium trifoliatum