The introduction of Centrolobium ochroxylum into Africa George K. Brizicky OriginalPaper Pages: 104 - 109
Systematics of the autoicous species of Ditrichum subg. Ditrichum Lewis E. AndersonVirginia S. Bryan OriginalPaper Pages: 121 - 137
Hybridization between Helianthus divaricatus and H. microcephalus Dale M. SmithA. T. Guard OriginalPaper Pages: 137 - 145