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3) Does someone know what plant the (radix) Rebundica comes from?

Google gives only a couple historic mentions in recipes

Some more for Rabundica... rhubarb?

In this biography (French) only rhubarb is mentioned (as a remedy):
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The translator rendered it as: "der Rabundica oder wilden Rhubarbara" (rabundica or wild rhubarb):
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But wild rhubarb a.k.a. burdock is not edible. Some other similar plant maybe.