Twinleaf, a native species, has been added to the USWildflowers.com database. Scientific name is Jeffersonia diphylla. This plant also goes by the common name Rheumatism Root.
Twinleaf – Jeffersonia diphylla
Twinleaf – Jeffersonia diphylla – Added to USWildflowers Database
Found the Twinleaf in Williamson County, Tennessee today (March 25th )
Saw one large and one smaller plant near Maiden Rock, Wisc. on Rustic Road off AA first a couple of weeks ago and now in seed. May 16, 2017