In The Garden: keep or pull?

A bunch of these small plants have appeared in my Vancouver garden. I think they're weeds, but they don't look familiar, so I thought I'd ask for ID help before yanking them out. A few of them have stretched out, like in the third picture.

Thanks!

 

Could it be a Baptisia?

 

Thanks, the leaves do look similar to baptisia, but unfortunately I'm pretty sure it's chickweed.

 

Not chickweed, unless you mean something different than what I know as chickweed.

 

So not stellaria media?

 

Nope, definitely not that. That has simple and oppositely-arranged leaves. These look like compound leaves.

 

Looks like a Medicago or Melilotus.

 

Thanks, I think it's medicago!

 

The stipules and leaflets look alike, so Lotus?