702 



AMERICAN FORESTRY 





A LEAF OF THE CALIFORNIA WALNUT 



The leaves of this species are compound, with from 9 to 17 leaf- 

 lets to each leaf. They are light yellowish green in color and 

 smooth on both the upper and lower surfaces when fully grown. 



its handsome color and good working qualities. 



It is a very rapid growing tree in youth, but rarely, 

 if ever, exceeds 150 years in age. Trees from 12 to 15 

 inches in diameter may be only 10 or 20 years old, while 

 one tree 15 inches in diameter showed an age of only 15 

 years. Probably one of the most valuable uses of the 

 California Walnut is as a grafting stock for the Eng- 

 lish or Persian Walnut, which is now being planted on 

 an extensive scale along the Pacific Coast, in the Missis- 

 sippi Valley and throughout the milder part of the east- 

 em United States. 



The Walnut of the Southwest is also a small tree, 

 rarely exceeding 50 feet in height. It develops a trunk 

 which sometimes attains a diameter of 5 feet, but usu- 

 ally ranges from 2 to 2^ feet in diameter. This tree 

 grows on the limestone banks of streams of central and 

 western Texas, where it is rarely more than 30 feet in 



height. It is commoner and attains a larger size in the 

 canyons of the mountains of New Mexico and Arizona 

 south of the Colorado Plateau. It is also found locally 

 in northern Mexico. 



The leaves of this Walnut are from 7 to 15 inches 

 long, and are made uj) of from 9 to 23 leaflets. The fruit 

 is round, usually from Yz of an inch to IJ/^ inches in 

 diameter, and covered with a thin husk, which is usually 

 smooth, but is occasionally covered with fine hairs. The 

 nuts have no ridges and are often compressed at the ends, 

 and sometimes flattened somewhat laterally. They are 

 dark reddish brown to blackish in color, usually 4-ce!led 

 at the base and 2-celled at the apex. The kernel is rather 

 small but sweet, and retains its flavor for a long time. 

 This Walnut of the Southwest is occasionally culti- 



BLACK WALNUT 



1. 



Branch with developing leaves and (s) three solitary catkins 

 of staminate flowers and (p) a spike with three pistillate 

 flowers. 



2. A staminate flower, slightly enlarged. 



3. A pistillate flower, slightly enlarged. 



4. A branch with mature leaf and fruit. 



5. A winter twig. 



6. Longitudinal section of twig showing chambered pith, en- 



larged. 



7. Section of twig showing superposed and gaping buds, and leaf- 



scars with three clusters of hundle-scars and notched upper 

 surface, slightly enlarged. 



8. A nut with husk removed. 



9. Terminal section of winter twig showing leaf-scar and ter- 



minal bud with bud-scales, slightly enlarged. 



