These two western Idaho weeds look like lambsquarter to me. One of them is blunt, and the other one is pointy (and much more susceptible to leaf miners and some disease that wilts the shoots and leaves). Are they both lambsquarter? What are the variety names, if you can tell? Because of the immaturity of the weed in the second picture, you might be tempted to say it's bind weed or something (but it's not; it's not a vine; the growth habit is just like that of the blunt variety).
Blunt variety (picture 1):
Blunt variety (picture 2):