Thanks very much for the id--I knew some of you would have the answer. Next season I will pay more attention to it earlier in the season. Right now, don't think it looks its best. LOL. I googled it after learning the name. When in bloom it is kind of pretty. Photo borrowed from UMASS Extension site:

Enjoy your first flower. Then, chop the vine back to the first leaf node. Apply a fertilizer (a rose or tomato fertilizer work fine). A couple of weeks later two new shoots will grow from the node. Pinch them back to their first nodes. Do this at least 2 or 3 times during the growing season. This fall plant your Clematis deeper, so the crown is 2-4" below the surface level. Next spring cut each shoot back and pinch all new growth. This treatment is recommended for all new Clematis until they get established (2-3 years). After this, you have to prune it depending on the type - we will need to know the name of your Clematis to give you an advice. Good luck!

I have an arbor where one side gets more shade, so it is planted with Confederate Jasmine. The other side is planted with Akebia. At a previous house, I had two annual vines...one had a tiny red bloom and the other a BES-looking tiny bloom...given to me by a coworker at the time, so I don't know the names. Those grew on the same arbor with an akebia. Cameron

Ditto on horsetail for the second. Probably E. arvense. For the first - Solomon's Seal and the other wild flowers that look similar to this like bell flowers and false Solomon's Seal are all native, desirable spring wild flowers. Nothing to be concerned with. Enjoy them! FataMorgana