We have lots of “stuff” in the pasture and we are trying to identify as much of it as we can to make sure that none of it is poisonous for the sheep.These are some of our most common weeds. Can you identify them?
Dandelion? Thistle?
Creeping Charlie? Dock? Creasy Salad?
Lambsquarters?
Square Peg Farm 
Those all look ok, Watch out for deadly nightshade.
All I can say is the last one looks like a maple tree. You can contact the local agriculture place for free info. They may send someone out or you probably can set up an appointment to take samples of the weeds to them. Look in the blue (government) part of the phone book. Maybe a neighbor has an extra or go online to fine it. Good luck.
oh, the second I think is dandelion maybe. I have lots of them and the roots go very deep. My horses will not eat them.
the third photo is of creasy greens