Corydalis

This corydalis just showed up in my yard growing along side an old fence post laying on the ground in a some what shady moist area. My question is what variety is it and is it a native plant. It has yellow flowers and I am not sure if it is corydalis aurea, the leaves don't look right.

 

The somewhat weedy Corydalis lutea?

 

Thank. I am always suspicious of vagrant plants showing up in my garden.