Ragweed. This is the weed that is making me sneeze, and itch with allergies. It is just one form of ragweed as there are many many different times from what I understand. This is the kind that grows here in our desert but is not a native plant here. I fight it and fight it and it always seems to win. On the plus side the horses seem to think it is as good as candy although how they can eat the stickery stuff is beyond me. These are little ones that escaped my figures and hoe. I have seen them get up to six feet tall with multiple stems full of flower stalks and seeds. And it is a very ugly, very tiny flower.