﻿CONTENTS. 



Page. 



Introductory statement 5 



Inventory 11 



Index of common and scientific names 113 



ILLUSTRATIONS. 



Page. 

 Plate I. Giant acorns of a Mexican oak (Quercus insignis, S. P. I. No. 39723). . 16 

 II. The sycamore fig (Ficus sycomorus, S. P. I. Nos. 39827, 39857, 



and 39858) 16 



III. An interesting hardy citrus fruit from Kansu, China (Citrus sp., S. 



P. I. Nos. 39897 and 40039) •....* 32 



IV. The Tangutian bush almond (Amygdalus tangutica, S. P. I. No. 



39898) 32 



V. A Kansu poplar (Populus suaveolens przewalskii, S. P. I. No. 39900). 36 

 VI. A tall-growing gooseberry from Kansu, China (Ribes alpestre gigan- 



teum, S. P. I. Nos. 39916 and 40022) 36 



VII. Trunk of Potanin's peach (Amygdalus persica potanini, S.P.I. No. 



40007) 48 



VIII. A hardy wild pear tree in Kansu. China (Pyrus ussuriensis, S. P. I. 



No. 40019) 48 



IX. A hardy gum-producing tree in Kansu, China (Eucommia ulmoides, 



S. P. I. No. 40028) 54 



3 



