Thalictrum clavatum

Thalictrum clavatum DC., known by its common name as the Mountain Meadow-Rue or Lady Rue, is a slender perennial forb of the Ranunculaceae family native to the South and Central Appalachian regions of the United States, namely the states of Virginia, Kentucky, Tennessee, and parts of North Carolina and West Virginia. This dicotyledon species is commonly found within seepages, moist forests, spray cliffs at waterfalls, and brookbanks in mountainous regions at elevations of 500 meters. It is distinctive due to its green-hued, roughly 1.5 foot-tall form and its panicle inflorescence arrangement of white flowers that bloom within the months of May to July....read more on Wikipedia.