I agree with gooseneck loosestrife. Many garden centers will no longer sell them because they are so invasive in many areas. I find them very difficult to remove… the underground runner red roots keep popping up and up and up.

The pic above is 2 stalks, not 2 flowers on the one stalk. If your picture looks like the one above except one bloom per stalk, I’m 100% sure Bobby correctly ID’d it for you.

Thank you for all your suggestions. This flower cascades one way and has thick red rhizome type roots. There is a small amount of red where the leaves and stem meet. It has spread, but it not out of control. The photo above is not the photo I sent in. Mine shows the flower cascading one way only. Not sure what happened.

Agree with Bobby, it’s gooseneck loosestrife and is VERY invasive in my southern Zone 7b location. It spreads by underground runners however, it’s easy to pull up and control.

Oops, maybe Goose neck loosestrife. See Jim’s link http://www.walterreeves.com/name-that-plant/perennial-plant/

Lizard’s Tail. http://www.walterreeves.com/name-that-plant/white-tilt-blooms-on-shade-plant/