Dianthus armeria
Garlic Mustard, Alliaria petiolata
Chickweed, Stellaria
Geum
Cardamine

Thank you jeanne. The 2nd ID is suspect. I pulled out lots of garlic mustard in the yard. This plant is reniform and less dentate. As far as I can tell it has not grown a stalk. The last pic is not cardamine,although now I know the name of that miserable plant I spend hours pulling. This plant is about 18" tall.

i'm no expert, but ....
gotta agree with the garlic mustard id on #2.
looks like it's growing happily in the midst of some ?mock strawberry? and oxalis -
(but then, it grows happily, and with great gusto ANYwhere and EVERYwhere. ; )

That's garlic mustard, #2, alliaria petiolata. It's a biennial. The first year it forms a rosette of the kind pictured in #2. The second year it sends up a tall stalk with a different shaped leaf (more dentate, less reniform), flowers, and ultimately, seed pods.

The third photo, the chickweed, looks like Stellaria graminea (lesser stitchwort). It's native to Europe, but pretty common in meadows in eastern US. The fourth photo is probably Geum canadense (white avens), which is native. The last is a Lepidium (pepper-grass).

I agree that #2 is Garlic Mustard. If you're unsure, break a leaf and smell it. Garlic Mustard is aptly named for the smell of the foliage.