Oxalis ?

This Oxalis has been growing in my yard in Mississippi and I would like to have proper ID. It is similar to some of the photos of Oxalis violacea but not all of them. I would appreciate anyones ideas.

 

Compare it to Oxalis debilis.

 

Well, it sure is similar. Thanks for the tip.

 

I may be wrong, but the dark (not greenish) center is more suggestive of O. articulata.

 

Could be O. articulata, which is not native. They did not say if it was a garden plant or wild.

 

Thanks! It could very well be O. articulata.