After having revised some genera represented in America the present author hopes to complete the revisions of all genera of Loganiaceae represented in America, except for Buddleja, Spigelia, and Strychnos. The latter three genera are being studied by, respectively, Dr. Eliane Norman, Dr. Homer Hurley, and Dr. B. A. Krukoff. Some of their publications are cited in this paper. The Loganiaceae have been the subject of discussion since the family was established. In the present author’s opinion their circumscription should be approximately like that of Solereder (1892) and exactly like that of Leenhouts (1962). The family is subdivided into ten tribes, eight of which are represented in America, with 15 genera in all.