I don't think that's celery.
Looks like dead dill weed to me?
Oh, well, it is wild celery to us. Not dill weed, either...
I've seen it enough to know..that's wild celery..ha..can you eat it?
YES! ...and you can eat it raw, just peel off the skin. Interestingly, the same juice that would burn your skin doesn't hurt you inside. It reacts to sunlight and can burn the heck out of you.