1. A revision of the American Hippocastanaceae-II

   • James W. Hardin

   OriginalPaper Pages: 173 - 195

2. A contribution toward a monograph of phaeocollybia

   • Alexander H. Smith

   OriginalPaper Pages: 195 - 217

3. Studies in western violets-VIII. The nuttalianae continued

   • Milo S. Baker

   OriginalPaper Pages: 217 - 230

4. A reconstitution of the genus machaeranthera

   • Arthur Cronquist
   • David D. Keck

   OriginalPaper Pages: 231 - 239

5. Notes and News

   • C. Frankton
   • H. W. Rickett

   News Pages: 240 - 240