Taxonomy of Gentiana, section Pneumonanthae, in eastern North America James S. Pringle OriginalPaper Pages: 1 - 32
Evidence from trichome morphology of interspecific hybridization in Vernoma: Compositae G. E. HunterD. F. Austin OriginalPaper Pages: 38 - 41
The genus ixocactus (Loranthaceae, s.s.): Description of its first species Job Kuijt OriginalPaper Pages: 62 - 67
The Echinocereus enneacanthus-dubius-stramineus complex (Cactaceae) Winifred O. Moore OriginalPaper Pages: 77 - 94