So many plants with similar rosettes, it can be really confusing. I really want to suggest Shepherd's Purse (Capsella bursa-pastoris), but I'm not at all sure.
Yes the few I thought were similar on close inspection the gradation of width is different, or opposite. The Shepherd's Purse suggestion is the closest thing I see looking at the pictures. I think that could be right!
I'm reading that they crop up in disturbed areas and this is the flowerbed where I dug out & discarded hundreds of lily of the valley last spring. So that could be why I never saw it before. And now, there's still more lily of the valley now encroaching into the lawn on the outside of the rock border.
I'm going to leave them grow a bit longer and see if that turns out to be for sure... It'll be lucky if it survives the lily of the valley anyway! ha! Maybe it can hold the space open for me until I get to that flowerbed. ha ha
Northeastern Pennsylvania USDA zone 6a bordering 5b, Sunset Zone 37 bordering 42 I'm brainwashing you with this signature block. watermelonpunch.com
Oftentimes, leaves change dramatically as a plant ages. White avens is one of my favorite wild plants for that reason. It ends up looking nothing like its early leaves. It's the changing foliage that makes me love it, not the inconspicuous flower.