OUR NUT TREES 



the hybrids I shall have something to say later. I 

 believe that in this country the best results will be 

 obtained by hybridizing /. regia with the Japanese 

 J. Sieholdiana and its variety cordiformis, which are 

 hardier, and the importance of this fact cannot be 

 over-estimated. What is needed is a hardier race 

 of thin-shelled Walnuts. From the viewpoint of 

 nut-fruits the next important Walnut is the Japanese 

 J. Sieholdiana, which is quite a recent introduction 

 to the west. It was first introduced into Leyden, 

 Holland, about 1864 by Von Siebold, and from there 

 to France in 1866. There is good reason to believe 

 that it was introduced into this country by Dr. G. R. 

 Hall in 1862, but the largest tree I know of is in the 

 Arnold Arboretum where it was raised from seeds 

 received from France in 1879. In Japan the Walnut 

 is known as "Kurume" and is distributed from the 

 south to the bitterly cold regions of central Hok- 

 kaido. The Kurume grows in moist forests and is a 

 much smaller tree than its European relative. The 

 fruit is borne in long racemes, and the nuts are ovoid 

 or globose, rounded at the base and pointed at the 

 apex, very slightly wrinkled and pitted, not ribbed, 

 and rather thick-shelled. 



Much cultivated in central Japan is the variety 

 cordiformis, characterized by its heart-shaped, much- 

 flattened, sharply two-edged nut which is smooth 

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