1. Tripsacum. With Dr. Hugh Cutler a preliminary survey of the genus Tripsacum has been published (separates available on request). The most important new fact turned up is a Tripsacum indigenous to South America from the Amazon Basin to Colombia. The numerous specimens from that region have at least one unique character and cannot therefore be recent introductions as had previously been supposed. The genus is so complex that it will take a decade to work out a complete and detailed monograph. In the meantime we shall be grateful for viable seeds or for chromosome counts of any species of Tripsacum from known localities.