Ann Burlingham writes:
Adam Schneider writes:

(I'm not sure which species of "Cardamine" is taking over my yard,
but the pictures on these pages give the general idea.)

seems to be edible. i like eating the enemy.

http://gardenbed.com/source/14/1343_edi.asp

hm, this seems to be less full of pop-ups:

http://www.arthurleej.com/p-o-m-Mar02.html