Late boneset

Eupatorium serotinum, also known as late boneset or late thoroughwort, is a fall-blooming herbaceous plant native to North America. Like other members of the genus Eupatorium, it is about one to two meters tall and has inflorescences containing a large number of white flowers with disc florets and no ray floretsl<br><br>
It ranges throughout most of the eastern United States, as far south as Mexico (near the Texas border), as far north as the United States–Canadian border, and as far west as Nebraska and Texas.<br><br>

It grows in open sites (either dry or moist), and can hybridize with Eupatorium perfoliatum and other members of the genus Eupatorium. Unlike wind-pollinated plants in this genus, E. serotinum is pollinated by insects. (information from Wikipedia)