Tassel Rue

Trautvetteria carolinensis ( Tassel Rue )
A moderate growing, clumping perennial, reaching up to 5 ( rarely over 3 ) feet in height, that is native to mountain woods, moist prairie and limestone bluffs in the eastern U.S. ( from southern Missouri to central Illinois to central Indiana to southwest Pennsylvania; south to northern Arkansas to northern Alabama to central Georgia to central South Carolina ). It is critically endangered in Missouri, Illinois, Arkansas and Mississippi. It is extinct from Indiana.
The deeply lobed, maple-like leaves are up to 16 inches wide. The handsome foliage is luxuriant mid-green above, bright green beneath.
The pure white flowers are borne during early summer.
Hardy zones 5 to 8 ( possibly 4 ) in partial to full shade on moist, fertile soil. Propagation is from division or seed.

Trautvetteria occidentalis ( Western Tassel Rue )
Similar except that it is native to the western North America ( from far southern coastal Alaska to Kitsault, British Columbia to Castlegar, B.C. to western Montana to far northwest Wyoming; south to central California to central New Mexico )