Can you tell us where you saw it (city, state)? Because that looks like quite a find and someone is going to wish it had sprung up in their neighborhood (including me). It looks like a Japanese Maple called a Moon Maple. If you managed to find one for sale, it would cost quite a bit. Look around for the adult trees (trees because it takes two) in someones front yard.
Its surprising the number of people who mistake them for marijuana plants but you would be disappointed if you smoked it. I have Japanese maples, including Moon Maples, and more than one person has asked why I'm growing my 'pot' on the front porch.
The other two plants are Lupins.