Dear Fiberbabe: I went back and finally found it, but what a mess of alternative names!

Common Names:
American Cranberry.
Cranberry Tree. Pimbina.
Flat Seed Berry.
Pembina. Nipiminan.
Crampbark Tree. Wild
Gueldes Rose. Gueldres
Rose. Cherry Wood. Dog
Rowan Tree. Whitten
Tree. Red Elder. Rose
Elder. Marsh Elder. Water
Elder. White Elder. Love
Rose. May Rose. Squaw
Bush. Witch Hobble.

And it says that if you ;eat many of them, they make you sick. The cranberries I used
to pick on Cape Cod are so goddam sour I have been told the Indians did not eat them.
It takes a lot of sugar to make them acceptable. I have never seen "high bush cranberries"
so don't know if they are also extremely sour. I'm surprised archaeologists could find
anything identifiable in those seeds.