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UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. 



Juglans major, as we call it. The plant may be only a form of Juglans 

 rupestris." Again, "The tree (Juglans major] is common throughout 

 southern Arizona, in mountain canons and alluvial soils of flood plains. 

 It grows at as low an altitude here as 1,500 feet and apparently as high 

 in the mountains as 8,000 feet, so you see it has a wide range. ' ' 



FIG. 12. Arizona black walnut tree, Vacaville. 



One old tree which we found growing in California, of supposedly 

 Arizona origin, is of interest in this connection. This is located on the 

 home place of Mr. Harbison, near Vacaville, and is a very large, erect 

 tree said to have been planted about 1854. The story is that Mr. Har- 

 bison's father crossed the plains in that year and picked up some wal- 

 nuts in Arizona, from one of which this tree came. The tree is of a 

 decidedly erect, tree-like type with none of the dwarf or bush form 



