foxglove (n.)

Old English foxes glofa, literally "fox's glove." The flower shape is that of the finger of a glove (compare German Fingerhut "foxglove," literally "thimble," the source of digitalis). The reason for fox is lost in the mute past of English herb-lore. Compare Old English plant names foxesfot ("fox's foot") "xiphion;" foxesclate ("fox's bur") "burdock."