Whorled Rosinweed, a native species, has been added to the USWildflowers database (08/06/2012.) Scientific name is Silphium trifoliatum. Photo below was taken in Wilson County, TN on Aug 4, 2012. It is also known by the common name Three-leaved Rosinweed. Go to the Whorled Rosinweed detail page for more photos and information.