THE ROMANCE OF OUR TREES 



and rather thin-shelled. In Japan there are two 

 well-marked forms of the type and intermediate 

 ones which connect it with the parent species J. 

 Sieboldiana. Raised from seed the var. cordiformis 

 cannot be depended upon to come true, for many 

 revert to the wild type. The Black Walnut {J. nigra) 

 is a magnificent tree producing valuable timber 

 but its nut is small, has a very hard shell, and 

 is of little economic value. The Texan Walnut {J. 

 rupestris) is a tree of quite moderate size and bears 

 small nuts of no particular use. The two Califor- 

 nian Walnuts (/. californica and J. Hindsii) are 

 large trees but their fruits are poor. The Formosan 

 species (/. formosana) is a large tree but the fruit is 

 small and, moreover, the plant will be hardy only in 

 the warmer parts of this country. It is growing in 

 the greenhouses of the Arnold Arboretum from seeds 

 I gathered in 191 8. 



The other species of Juglans to be considered are 

 best classed as Butternuts, and the best known and 

 most valuable is the American J. cinerea. This is a 

 tree occasionally 100 feet tall and 10 feet in girth of 

 trunk with a broad, round-topped crown, and is dis- 

 tributed in eastern North America, from the valley 

 of the St. Lawrence River southward. It was in- 

 troduced into England with the Black Walnut as 

 long ago as the middle of the 17th century. The 



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