1. Taxonomy of Gentiana, section Pneumonanthae, in eastern North America

   • James S. Pringle

   OriginalPaper Pages: 1 - 32

2. New species in Cienfuegosia

   • Paul A. Fryxell

   OriginalPaper Pages: 33 - 37

3. Evidence from trichome morphology of interspecific hybridization in Vernoma: Compositae

   • G. E. Hunter
   • D. F. Austin

   OriginalPaper Pages: 38 - 41

4. Revision of Dicorynia (Cassieae, Caesalpiniaceae)

   • Robert C. Koeppen

   OriginalPaper Pages: 42 - 61

5. The genus ixocactus (Loranthaceae, s.s.): Description of its first species

   • Job Kuijt

   OriginalPaper Pages: 62 - 67

6. A new species of Carex from Chiapas, Mexico

   • F. J. Hermann

   OriginalPaper Pages: 68 - 69

7. The grass genus Andropogon in the United States

   • Frank W. Gould

   OriginalPaper Pages: 70 - 76

8. The Echinocereus enneacanthus-dubius-stramineus complex (Cactaceae)

   • Winifred O. Moore

   OriginalPaper Pages: 77 - 94

9. Faustino Miranda, 1905–1964

   • Jerzy Rzedowski

   Announcement Pages: 95 - 98

10. News and notes

    News Pages: xxvii - xxvii