The root of Caulophyllum thalictroides. Also called Blue Cohosh (Bartlett).

1

1816.  This uncommon event of a woman being speedily delivered of a beautiful boy, was owing to the miraculous power of a dose and a half of his papoose root!—Review of Henry’s ‘American Herbal’ in the Analectic Mag., vii. 263 (March).

2