I don't know what it is, but i cut one down on my property. It grew from seed and within two years, it was about 25 feet tall! I have seen them planted in parking lots here and also growing wild (not sure if native or introduced) in the foothills of the Sierra Nevada (Millerton Lake to be more specific).

The first one is Rudbeckia triloba. The last one looks like purslane, a weed. No idea what the center one is, but I'd leave it to grow.

Do they bloom with a yellow head? Sorta look like goldenrod.

Thank you all so much! I am reading here often, have gotten answers for some plants by the answers you have given others. My lawn is a big part weeds. With all the rain we have had, mowing is still not possible, so a lot of these plants are getting the chance to flower. They will probably end up in the flower beds sooner rather than later. So I will be spending a lot of time on the weed website and ask questions here...Just a picture to show how little grass there actually is in some places.