The National Museum has recently received from Mr. Guillermo Klug, of Iquitos, Peru, a large collection of plants obtained by him in the Putumayo region of southeastern Colombia. Mr. Kug became especially interested in various drug plants used by the natives as stimulants, and included herbarium specimens of these in his collection. Three of the plants, knowns to the Indians under the general name of yagé, belong to the genus Banisteriopsis C.B. Robinson (Family Malpighiaceae), subgenus Eubanisteriopsis Morton, nomen novum (Banisteria subgenus Eubanisteria Niedenzu). The necessity for using the name Banisteriopsis for this genus has been discussed by the author in a former paper. The type of the genus (and subgenus) is Banisteriopsis argentea (Kunth) Robinson & Small.