1. Pollen differences between Stylisma and Bonamia (Convolvulaceae)

   • Walter H. Lewis

   OriginalPaper Pages: 331 - 334

2. The geologic history of the Lythraceae

   • Alan Graham
   • Shirley A. Graham

   OriginalPaper Pages: 335 - 346

3. International Organization of Chemosystematics

   Announcement Pages: 346 - 346

4. New names and combinations in Trixis (Compositae)

   • Christiane Anderson

   OriginalPaper Pages: 347 - 353

5. Chromosome numbers of some new world species of Thelypteris

   • Alan R. Smith

   OriginalPaper Pages: 354 - 360

6. Taxonomy and distribution of Clematis, sect. Atragene (Ranunculaceae), in North America

   • James S. Pringle

   OriginalPaper Pages: 361 - 393

7. Studies of Pacific Island Plants, XXIV. The genus Terminalia (Combretaceae) in Fiji, Samoa, and Tonga

   • Albert C. Smith

   OriginalPaper Pages: 394 - 412

8. Geographic variation in a widespread neotropical species, Mouriri myrtilloides (Melastomataceae)

   • Thomas Morley

   OriginalPaper Pages: 413 - 424

9. Genetic affinities of the North American species of Hibiscus sect. Trionum

   • Dwayne A. Wise
   • Margaret Y. Menzel

   OriginalPaper Pages: 425 - 437

10. New species of Phanerogams from Amazonia

    • Ghillean T. Prance

    OriginalPaper Pages: 438 - 445

11. Note on Haplopappus gracilis and H. Ravenii—A reply

    • R. C. Jackson

    Letter Pages: 446 - 446