The American Materia Medica, Therapeutics and Pharmacognosy, 1919, was written by Finley Ellingwood, M.D. Opium. Papaver somniferum. Conium. Conium maculatum. Cannabis. Cannabis indica. Book Navigation ‹ A Tabulated Summary and Comparison of the action of Fever Remedies. up Opium. Papaver somniferum. ›