The possessive case and its governing noun, combining to form a metaphorical name, should be written with both apostrophe and hyphen; as, Job's-tears, Jew's-ear, bear's-foot, colts-tooth, sheep's-head, crane's-bill, crab's-eyes, hound's-tongue, king's-spear, lady's-slipper, lady's-bedstraw, &c. (6.)