Three new species of Tigridia (Iridaceae) from Mexico Robert William Cruden OriginalPaper Pages: 314 - 320
Past hybridization between Quercus macrocarpa and Quercus gambelii Jack Maze OriginalPaper Pages: 321 - 333
The rediscovery of Anotea flavida (DC.) Ulbr. (Malvaceae) Paul A. Fryxell OriginalPaper Pages: 334 - 335
Cytotaxonomic notes on eleven species of Cirsium native to Mexico Gerald B. Ownbey OriginalPaper Pages: 336 - 342
The effect of change of number of OTU’s in a numerical taxonomic study Theodore J. Crovello OriginalPaper Pages: 346 - 367
Systematic relationships in the Cosmanthus phacelias (Hydrophyllaceae) George W. Gillett OriginalPaper Pages: 368 - 374
A new species of Townsendia (Compositae) from Utah Stanley L. WelshJames L. Reveal OriginalPaper Pages: 375 - 377
The typification and application of the Linnaean binomials in Gossypium Paul A. Fryxell OriginalPaper Pages: 378 - 386