I first noticed this weed a few years ago, and saw its long, thin, V-shaped bean-shaped seed pods on meter height plants. The pods start out connected together at the far end, but eventually separate into an inverted V.
If I recall, correctly, the thin pods split open to release very small seeds with a sail.
It somewhat resembles milkweed, but is branched, red stemmed and, of course, has these strange pods.
Location: My back yard, in Augusta County, in the Shenandoah Valley in Virginia.