Biological Studies in Central America: The Twenty-Eighth Annual Systematics Symposium
Biological Studies in Central America: The Twenty-Eighth Annual Systematics Symposium: [Introduction], p. 431
Nancy R. Morin
Plate Tectonic Constraints on the Biogeography of Middle America and the Caribbean Region, pp. 432-443
Peter J. Coney
Vicariance Biogeography in Mesoamerica, pp. 444-463
C. J. Humphries
The Enigma of the Central American Herpetofauna: Dispersals or Vicariance?, pp. 464-547
Jay M. Savage
The Origin of the Pteridophyte Flora of Central America, pp. 548-556
Luis D. Gomez P
Neotropical Floristic Diversity: Phytogeographical Connections Between Central and South America, Pleistocene Climatic Fluctuations, or an Accident of the Andean Orogeny?, pp. 557-593
Alwyn H. Gentry

Plant Geographical Results of Changing Cenozoic Barriers
A Review of the Phytogeographic Evidences for Pleistocene Climate Changes in the Neotropics, pp. 594-624
Ghillean T. Prance
Changing Cenozoic Barriers and the Australian Paleobotanical Record, pp. 625-667
Helene A. Martin
Wallace's Line: A Result of Plate Tectonics, pp. 668-675
T. C. Whitmore
Causes of Short-Term Sequential Changes in Fossil Plant Assemblages: Some Considerations Based on a Miocene Flora of the Northwest United States, pp. 676-734
Aureal T. Cross; Ralph E. Taggart