Unknown Plant On My Patio

I had a small "surprise" pop up in one of my pots. I live 3 stories up, plant pretty much the same thing every year as I have for the last 8 years. I had this guy pop up in the pot where I grow my 4 o'clocks. I hate to pluck him out with out knowing how he got here or what he is. Can anyone help. What is this plant?

 

Looks really familiar, but I can't quite place it. I want to say bindweed, but the leaves are wrong. I'd let it go for a while, though - it's not really hurting anything at the moment.

 

Maybe a legume.

 

a Legume of some sort.

HTH
Chris

 

Put a small bamboo stake in it to see if it will go up and blossom!

 

I thought Legume, something is not right though.

 

Everyone is saying Legume, I thought so but something don't look right, I will let it grow a bit more.

 

I thought Legume, something is not right though will watch for while.

 

I'm not sure what it is.

But the photo sure got me to wondering if that was your finger or toe on the right side - LOL

Was wondering if you garden like a primate or a person. : - )

Healthy small plant whatever it is.

 

Maybe it will get more coarse, grow stickers and then ---- berries! :)