An Interesting Weed

Every now and then this weed would appear around the base of the plants and i would try to pull it out.  A few days ago, i spotted a big plant which was flowering. A pleasant surprise! I have absolutely no idea the flower would look like this.  An absolutely wicked looking black flower.  Why would a flower be black in color? Interesting!!  I did not smell anything in the air but perhaps i was not equipped to.