I can confirm that #1 is indeed Velvetleaf (Abutilon theophrasti), as identified by Kent Pfeiffer. I checked under a leaf and found a characteristic yellow flower and seedpods.
In this area, Paulownia grows along the Susquehanna River and some of its tributaries. I live on a drought-prone hill about 2 miles from the river. I love its beautiful purple flowers.
#2 is indeed American-Burnweed-Erechtites-hieraciifolius. I could not tell that from the images posted on ATP, so I googled it and found an image that clearly matches.
As for Rumex (dock) for #3, I was amazed at the number of different species of dock there are in the world. Mine resembles curly dock (Rumex crispus), as suggested by greene.
Bottom line: I think you all have identified all three of my mystery guests. I think that I will keep #1 and discard # 2 and #3.
Thank you so much for your help! Thanks too for suggesting one mystery plant per posting! I will do that if future unknown plants pop up.
