Chromosome numbers in Hypericum and related genera N. K. B. RobsonPreston Adams OriginalPaper Pages: 95 - 106
Yellow-flowered species of Linum in Central America and western North America C. M. Rogers OriginalPaper Pages: 107 - 135
Nota sobre la identidad de los generos Aiolotheca DC. y Tonalanthus T. S. Brandegee (Compositae) J. Rzedowski OriginalPaper Pages: 166 - 168
The systematics of autopolyploidy in Epilobium latifolium (Onagraceae) Ernest Small OriginalPaper Pages: 169 - 181