48 Bulletin of fix University of 



1. Juglans nigra Linnaeus. Walnut. Black Walnut. One 

 of the grandest and most valuable of our forest trees, reach- 

 ing a height of 100 to 150 and trunk diameter of 4-6 with 

 straight trunk, stout branches, and thick, furrowed bark. 

 Leaves 12'-28' long; leaflets 12-23, ovate-lanceolate, glabrous 

 above, pubescent below. Nut nearly round, somewhat flat- 

 tened, IVs' to 114' in diameter. The kernel is sweet and edible. 



In well drained soil from Ontario south to the Gulf States 

 and west to Nebraska and Texas. Because of the value of 

 the nuts and of the wood, the black walnut has been a favor- 

 ite tree and is frequently planted throughout its range. 



The wood is heavy, hard, strong and rather coarse. The 

 heart wood is a beautiful dark brown, and takes a high polish. 

 It is much sought by furniture makers and is used extensively 

 in the manufacture of ornaments and for gun stocks. The 

 supply of available timber has been almost exhausted. The 

 tree has been planted extensively for ornament, but does not 

 make a very satisfactory shade tree. 



2. Juglans rupestris Engelm. Texan Walnut. A forest 

 tree 50 in height but in our area usually much smaller. The 

 upright growing branches form a narrow stiff crown. The 

 bark on young trees is thin and pale, becoming deeply fur- 

 rowed and broken on the older portions. Leaves 7'-15' long, 

 with 9-23 short stalked, ovate-lanceolate leaflets which are 

 2i/ 2 '-5' in length by Mj'-lVi' in width. The leaflets are dark 

 yellow green, glabrous or pubescent along the midribs, finely 

 serrate, somewhat curved wdth a rounded base. Fruit globose 

 to oblong 14' to 1%' in diameter with a thin husk; nut globose 

 and with deep prominent ridges, sweet and edible. 



Extends from the limestone regions of western Texas to 

 Arizona, New Mexico, and northern Mexico. In Texas it 

 occurs along stream banks of the limestone area, reaching 

 its maximum size in the canyons. 



The trees of our area are small and of little economic im- 

 portance. The wood is hard, close-grained, weak, dark brown 

 in color. The tree is occasionally planted for ornament, and 

 grows well in localities outside its natural range. 



3. Juglans Californica Wats. California Walnut. A 

 stately forest tree reaching 60 in height by 18'-20' in diam- 



