1. Chromosome numbers of some North American Salix

   • Yutaka Suda
   • George W. Argus

   OriginalPaper Pages: 191 - 197

2. Materials for a monograph of Freycinetia (Pandanaceae) III. Freycinetia corneri, a new species from Malaya

   • Benjamin C. Stone

   OriginalPaper Pages: 198 - 202

3. Maranthes (Chrysobalanaceae), a new generic record for America

   • Ghillean T. Prance

   OriginalPaper Pages: 203 - 204

4. Polyploidy in Ambrosia dumosa (Compositae: Ambrosieae)

   • Peter H. Raven
   • Donald W. Kyhos
   • Willard W. Payne

   OriginalPaper Pages: 205 - 211

5. Change of address for editor-in-chief

   • J. R. Reeder

   Announcement Pages: 211 - 211

6. Chromosome numbers and polyploidy in Castilleja (Scrophulariaceae)

   • Lawrence R. Heckard

   OriginalPaper Pages: 212 - 226

7. A new species of Croton (Euphorbiaceae) widespread in Mexico

   • Marshall C. Johnston

   OriginalPaper Pages: 227 - 229

8. Parasite relationships and disposition of Filipendula

   • D. B. O. Savile

   OriginalPaper Pages: 230 - 231

9. Fosteria, a new genus of Mexican Iridaceae

   • Elwood Molseed

   OriginalPaper Pages: 232 - 234

10. A new species of Nemastylis (Iridaceae) from Mexico

    • Elwood Molseed
    • Robert W. Cruden

    OriginalPaper Pages: 235 - 237

11. Evidence for the hybrid origin of Flaveria latifolia (Compositae)

    • Robert W. Long
    • Ernest L. Rhamstine

    OriginalPaper Pages: 238 - 250

12. A numerical taxonomic study of Cucurbita

    • A. M. Rhodes
    • W. P. Bemis
    • S. G. Carmer

    OriginalPaper Pages: 251 - 266

13. Taxonomy of Senecio multilobatus and its allies

    • T. M. Barkley

    OriginalPaper Pages: 267 - 284

14. North American Flora

    • Clark T. Rogerson

    Announcement Pages: 285 - 285