PREFACE vii 
species discovered by Wilson in his four journeys. It is safe to 
say that few travelers, however, have discovered as many new 
plants; certainly no other man has ever introduced so many 
woody plants of exceptional interest and value into cultivation. 
This will appear when it is realized that in the first volume of 
the Plantae Wilsonianae, which we believe contains the enumer- 
ation of about one-half of Wilson’s Arboretum collections, there 
are described two new genera, two hundred and twenty-five 
new species and one hundred and sixty-two new varieties of 
woody plants. In earlier publications have appeared descrip- 
tions of two new genera and about one hundred new species of 
woody plants discovered by Wilson in his first journeys. 
In the preparation of this work the Arboretum is indebted to 
a number of European specialists who have elaborated several 
different groups, and I take this opportunity to extend to them 
the cordial thanks of the Arboretum. 
C. S. SARGENT. 
Mar, 1913. 
