xii Preface. 



ii. 



All the native and escaped vines found in Canada and 

 the northern United States (east of the line of the Missis- 

 sippi River, and north of the line of the southern boundary 

 of Pennsylvania) are described in the following pages ; 

 and all are pictured, in natural size, excepting in a few cases 

 where the close resemblance to other forms makes repeti- 

 tion unnecessary. 



The three guides — for flower, and leaf, and fruit — will 

 be readily understood, and will make identification in 

 most cases easy. 



Technical terms are avoided, as far as possible, 



I have reason again to thank Dr. N. S. Britton, 

 Emeritus Professor in Columbia University and Director 

 of the New York Botanical Garden, for valuable aid and 

 suggestion. 



