Also called American Bugbane and sometimes Black Snakeroot, this wild perennial is more popular with gardeners all the time. Its tall, so best in the background, where its towers of flowers (up to 8 ft.) will light up the woods.
Black Cohosh likes wet woods, thickets, and is native all the way from Eastern Canada into Georgia.
By the way, this is one native that has recently been reclassified. Most still call it Cimicifuga racemosa, but the official botanical name is now Actaea racemosa.