The American Materia Medica, Therapeutics and Pharmacognosy, 1919, was written by Finley Ellingwood, M.D. Cactus. Cactus grandiflorus. Digitalis. Digitalis purpurea. Crataegus. Crataegus oxyacantha. Strophanthus. Strophanthus hispidus. Convallaria. Convallaria majalis. Lycopus. Lycopus virginica. Book Navigation ‹ Group II. Agents acting upon the heart. up Cactus. Cactus grandiflorus. ›