Looks like an Epimedium.

Prosartes or similar.

[Will insert name of the aster family genus when I remember it] or similar.

I do believe it is Prenanthes alba. The newly, just sprouted leaves look much different than the mature ones.

FataMorgana

I found 3 sites that showed younger plants of Prenanthes alba, and I see now why the ID was confusing. Like you mentioned, the young leaves are dramatically different than later growth. The sites do seem to confirm that these are Prenanthes alba; thanks, FataMorgana, for the lead:

http://wisplants.uwsp.edu/scripts/bigphoto.asp?bigphoto=PREALB_MMI.jpg&taxon=Prenanthes%20alba%20L.&phog=Mark%20Mittelstadt&spcode=PREALB

http://www.dailykos.com/story/2010/06/20/877775/-Free-Food-IDing-Plants-Now-to-Forage-Next-Year

http://www.flickr.com/photos/mapprospector/521218925/?rb=1

Not a problem! Look later in the season for a tall plant where these had been. It is hard to believe it is the same plant.

FataMorgana

Yes: Prenanthes is what I had in mind. Obviously it's not Prosartes.