1. Studies in Pacific Rubiaceae: VI-VIII

   • F. R. Fosberg

   OriginalPaper Pages: 287 - 294

2. Supplementary notes on American Labiatae. X

   • Carl Epling
   • Carlos Játiva

   OriginalPaper Pages: 295 - 313

3. Three new species of Tigridia (Iridaceae) from Mexico

   • Robert William Cruden

   OriginalPaper Pages: 314 - 320

4. Past hybridization between Quercus macrocarpa and Quercus gambelii

   • Jack Maze

   OriginalPaper Pages: 321 - 333

5. The rediscovery of Anotea flavida (DC.) Ulbr. (Malvaceae)

   • Paul A. Fryxell

   OriginalPaper Pages: 334 - 335

6. Cytotaxonomic notes on eleven species of Cirsium native to Mexico

   • Gerald B. Ownbey

   OriginalPaper Pages: 336 - 342

7. Vilobia, a new genus (Compositae—Tageteae)

   • John L. Strother

   OriginalPaper Pages: 343 - 345

8. The effect of change of number of OTU’s in a numerical taxonomic study

   • Theodore J. Crovello

   OriginalPaper Pages: 346 - 367

9. Systematic relationships in the Cosmanthus phacelias (Hydrophyllaceae)

   • George W. Gillett

   OriginalPaper Pages: 368 - 374

10. A new species of Townsendia (Compositae) from Utah

    • Stanley L. Welsh
    • James L. Reveal

    OriginalPaper Pages: 375 - 377

11. The typification and application of the Linnaean binomials in Gossypium

    • Paul A. Fryxell

    OriginalPaper Pages: 378 - 386

12. Reproductive barriers in Clarkia deflexa

    • Dennis R. Parnell

    OriginalPaper Pages: 387 - 394