Biosystematic Studies in Papaver Section Oxytona. Peter Goldblatt

Ecological Differentiation in some Congeneric Species of Costa Rican Flowering Plants. William C. Burger

Evolution of Systematic Characters in the Ferns--A Symposium Introduction. Thomas N. Taylor & John T. Mickel

The Significance of Chromosome Numbers in Ferns. Donald M. Britton

Reproductive Biology and Evolution in the Pterdiophyta. Robert M. Lloyd

Structure of Spores in Relation to Fern Phylogeny. Warren H. Wagner, Jr.

Cretaceious Salviniaceae. John W. Hall

Phytochemical Aspects of Fern Systematics. David E. Giannasi

Comparative Anatomical Studies of the Ferns. Richard A. White

Evolutionary Trends in the Marattiales. Benton M. Stidd

Variable Expression of the Appendicular Status of the Megaphyll in Extant Ferns with Particular Reference to the Hymenophyllaceae. David W. Bierhorst

Evolution of Vegetative Morphology in Coenopterid Ferns. Tom L. Phillips

Systematic Characters of Devonian Ferns. Stephen E. Scheckler

Phyletic Lines in the Modern Ferns. John T. Mickel

A Reconsideration of Spondias mombin L. (Anacardiaceae). Thomas B. Croat

Cienfuegosia Cav. extended to Madagascar. Paul A. Fryxell

Studies of Bignoniaceae 11: A Synopsis of the Genus Distictis. Alwyn H. Gentry

Jacquemontia ovalifolia (Convolvulaceae) in Africa, North America, and the Hawaiian Islands. Kenneth R. Robertson

Notes on Some Critical Characters in Columnea Classification. Brian D. Morley

NOTES

Casearia belizensis Standley, a Synonym of Laetia Procera (Poeppig) Eich. (Flacourtiaceae). Thomas B. Croat & Ronald L. Liesner

Diphyscium rotundatifolium, a New Species from Taiwan. Chung-k`uei Wang & Sang-hsiung Lin

Notes on Rhynchospora (Cyperaceae). Gerrit Davidse

Anatomic Consideration of the Calyx of Andenocalyma comosum (Cham.) A.P. DC. Rose Claire Laroche

Gibsoniothamnus (Scrophulariaceae) in Panama. Alwyn H. Gentry

Eastern Poppies. Editor