White Flower, stumped me for 2 years.
I've had this white wildflower in my collection for 2 years, and I haven't been able to identify it. Maybe you guys can. It's a tall, flowering plant that was about 2 feet high originally. It had opposite, heart-shaped, toothed leaves. There was a cluster of white, four-petaled flowers at the top of the plant and only at the top. I found it growing on the side of a trail in a heavily-forested park.