1. Chromosome numbers in some North American species of the genus Cirsium. III. Western United States, Mexico, and Guatemala

   • Gerald B. Ownbey
   • Peter H. Raven
   • Donald W. Kyhos

   OriginalPaper Pages: 297 - 304

2. Statistical character weighting and similarity stability

   • Robert P. Adams

   OriginalPaper Pages: 305 - 316

3. Biosystematics of Draba cuneifolia and D. platycarpa (cruciferae) with emphasis on volatile and flavonoid constituents

   • Ronald L. Hartman
   • John D. Bacon
   • Charles F. Bohnstedt

   OriginalPaper Pages: 317 - 327

4. Systematics of the North American desert species of Abronia and Tripterocalyx (Nyctaginaceae)

   • Leo A. Galloway

   OriginalPaper Pages: 328 - 347

5. New species and combinations in Sabazia (Heliantheae, Galinoginae)

   • Lowell E. Urbatsch
   • B. L. Turner

   OriginalPaper Pages: 348 - 354

6. A Systematic study of the genus Balduina (Compositae, Heliantheae)

   • Earl S. Parker
   • Samuel B. Jones

   OriginalPaper Pages: 355 - 361

7. A new simplified method for constructing Wagner networks and the cladistics of Pentachaeta (Compositae, Astereae)

   • Charles H. Nelson
   • Gene S. Van Horn

   OriginalPaper Pages: 362 - 372

8. Revision of the bulbous Iridaceae of North America

   • Peter Goldblatt

   OriginalPaper Pages: 373 - 385

9. Notes and news

   News Pages: 386 - 387