1. Intergeneric hybrids in the lychnideae (Caryophyllaceae)

   • A. R. Kruckeberg

   OriginalPaper Pages: 311 - 321

2. Plants of the new albany shale. II. Callixylon arnoldii Sp. Nov.

   • Charles B. Beck

   OriginalPaper Pages: 322 - 327

3. Persoon and the subspecies

   • Bernard Boivin

   OriginalPaper Pages: 327 - 331

4. Revision of condalia including microrhamnus (Rhamnaceae)

   • Marshall C. Johnston

   OriginalPaper Pages: 332 - 368

5. Studies on lactarius-III The North American species of section plinthogali

   • Alexander H. Smith
   • L. E. Hesler

   OriginalPaper Pages: 369 - 440

6. Tropical American plants, IV

   • Louis O. Williams

   OriginalPaper Pages: 441 - 446

7. Closing date for research proposals, National Science Foundation

   Announcement Pages: 446 - 446