Taxonomy of Helenium sect. Tetrodus and a conspectus of North American Helenium (Compositae) Mark W. Bierner OriginalPaper Pages: 331 - 355
Evolutionary trends in the Central American species of Piper (Piperaceae) William C. Burger OriginalPaper Pages: 356 - 362
A biosystematic study of the Interiores species group of the genus Vernonia (Compositae) W. Zack Faust OriginalPaper Pages: 363 - 378
Chromosome numbers in North and Central American Compositae Jerold L. GrashoffMark W. BiernerDavid K. Northington OriginalPaper Pages: 379 - 394
Tres adiciones al genero Baccharis (Compositae) en Mexico J. Rzedowski OriginalPaper Pages: 398 - 402
Free amino acids as taxonomic characters in the tribe Arundinelleae (Gramineae) Venkata B. ReddiJames B. Phipps OriginalPaper Pages: 403 - 414
The taxonomic significance of the fatty acid content of seeds of Linum C. M. Rogers OriginalPaper Pages: 415 - 419
A new Costa Rican species of Centropogon: C. irazuensis (Campanulaceae-Lobelioideae) Robert L. Wilbur OriginalPaper Pages: 420 - 424