49 



Conifers: 8 genera, 14 species. 

 Gnetaceae: i species, Gnetum Gnemon. 

 Cactaceae: 28 genera, 119 species. 



Many maps of woody plants in the General Systematic Section 

 (Section I) were revised, in particular the barberries, preparatory 

 to rearrangement. 



Labels and Signs 



Labels and signs were made as follows: 



Steel labels for the beds 423 



Family labels for the beds 188 



Lead labels for woody plants 275 



Lead labels for conservatory 6 



Lead labels for rock garden 243 



Small wood labels 266 



Large wood labels for horticultural forms 12 



Wooden signs 48 



Cardboard signs 162 



Total 1 ,623 



Also numerous other miscellaneous signs. 



International Seed Exchange 



Correspondence with other botanic gardens regarding greater 

 uniformity of seed lists was continued. A fourth communication, 

 issued in mimeograph form in May and sent to about 100 botanic 

 gardens in all parts of the world, contained an appeal for the 

 formation of an International List of Genera of Plants Cultivated 

 in Botanic Gardens, to be published in the name of many institu- 

 tions. To make this proposal more definite a preliminary Index 

 of Genera of about 3,000 names as actually used in about go seed 

 lists was forwarded. About 2,300 names were listed in capitals; 

 these were the names accepted by both the Genera Siphonogarum 

 of Dalle Torre and Harms and by the Index Kewensis; or for 

 the ferns accepted in Christensen's Index Filicum. About 730 

 names are those as to which there is more or less difference in 

 usage. Final settlement of disputed questions is not sought, but 

 rather a practical compromise especially to simplify the interna- 

 tional exchange of seeds. Replies received indicate a favorable 

 attitude on the part of many botanic gardens. 



