"Somewhat" edible?
What I found so far (and this might not be right since I haven't looked thoroughly) indicated that the American species berries are edible raw but you shouldn't eat too many at a time, and that some people experience digestive discomfort after eating them. They are described as "astringent" but "palatably sweet" according to one source.
People say you can boil them and make a jelly or syrup out of the juice which is what I was thinking of doing if this is the right species.
So I rounded that to "somewhat" edible.