The maritime species of Abronia (Nyctaginaceae) Stephen Szlatenyi Tillett OriginalPaper Pages: 299 - 327
Analysis of chemical and morphological variation in the Ramalina siliquosa species complex William Louis Culberson OriginalPaper Pages: 333 - 352
A revision of Solanum sect. Brevantherum (Solanaceae) in North and Central America Keith E. Roe OriginalPaper Pages: 353 - 373
Interspecific hybridization and its evolutionary significance in the genus Aquilegia Ronald J. Taylor OriginalPaper Pages: 374 - 390
A new species of Polymnia (Compositae: Heliantheae) from Mexico James R. Wells OriginalPaper Pages: 391 - 394