VI EDITORIAL NOTE 



eludes the species of China and Korea. The synoptical accounts 

 of Rosa, Dentzia, Hydrangea, and several other genera are restricted 

 to the Chinese species. 



The herbarium staff of the Arboretum, consisting of Messrs. 

 Rehder, Wilson, Shaw and Schneider, have been assisted in the prep- 

 aration of this work by a number of European specialists. Dr. E. 

 Janczewski of Krakow has prepared the account of Ribes; Dr. E. 

 Koehne of Berlin that of Prunus, Maddenia and Philadelphus; Dr. 

 W. O. Focke of Bremen that of Rubus; Dr. T. Loesener of Berlin that 

 of the Aquifoliaceae; Dr. F. Gagnepain of Paris that of the Vita- 

 ceae; Dr. A. B. Rendle of the British Museum has determined 

 the Bambuseae collected by Wilson; Dr. J. S. Gamble, late 

 of the Indian Forest Service, has elaborated the Lauraceae; 

 Mr. W. G. Craib of the Royal Gardens, Kew, the Leguminosae; 

 Mr. J. Hutchinson of the same institution the Euphorbiaceae and 

 Rubiaceae; Dr. H. Harms of Berlin the Araliaceae; Dr. Henri 

 Lecomte of Paris the Loranthaceae. Mr. J. B. Norton of the De- 

 partment of Agriculture of the United States has prepared the ac- 

 count of Smilax and Heterosmilax. I take this opportunity to thank 

 these men in the name of the Arboretum for the assistance they have 

 given us in elaborating these difficult groups. Without it want of 

 sufficient material in American herbaria would have long delayed the 

 c^aiApletion of this work. 



' For the arboriculturist and the gardener the results of Mr. Wilson's 

 journeys are as important and interesting as they have been for the 

 botanist. During his two journeys in China for the Arboretum, 

 Wilson collected 1593 lots of seeds, and 168 lots of plants and cut- 

 tings representing 1 193 species and varieties of woody plants. From 

 these, plants of 918 species and varieties have been successfully 

 raised at the Arboretum. Many of these plants, including most of 

 the large collection of Rhododendrons and other broad-leaved ever- 

 greens, and the plants found only at low levels in central China, 

 have, however, not proved hardy in Massachusetts; and of the 

 plants raised here from the seeds and cuttings collected by Wilson 

 473 species and varieties are now established in the Arboretum. The 

 seeds collected by Wilson were shared with the best cultivators in 

 the United States and Europe; and plants of the 445 species and 

 varieties raised here which cannot grow in Massachusetts have also 

 been widely distributed and are now growing in the gardens of many 

 temperate regions, especially in those of our Pacific coast states 



