Origin and maintenance of clinal variation in nuphar (Nymphaeaceae) C. E. DePoeE. O. Beal OriginalPaper Pages: 15 - 28
Evidence for autoploid evolution in the artemisia ludoviciana complex of the Pacific Northwest James R. Estes OriginalPaper Pages: 29 - 43
Chemical and morphological analysis of introgressive hybridization between iris tenax and I. chrysophylla Lynne C. CarterBert G. Brehm OriginalPaper Pages: 44 - 54
Taxonomy of carex sect. atratae (cyperaceae) in the southern rocky mountains David F. Murray OriginalPaper Pages: 55 - 76
A new species of carex sect. bracteosae Robert H. MohlenbrockJohn Schwegman OriginalPaper Pages: 77 - 79
Occurrence of a winged perispore in a new world species of polypodium Robert M. Lloyd OriginalPaper Pages: 80 - 82
Variation and taxonomy of pitcairnia (Bromeliaceae) in Jamaica Robert W. Read OriginalPaper Pages: 83 - 90
U. S. National Committee for INQUA announces travel support program for eight INQUA congress in Paris Announcement Pages: N2 - N2