48 Bulletin of the University of Texas 
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, 114’ to 144’ 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. duglans 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 irees is thin and pale, becoming deeply fur- 
rowed and broken on the older portions. Leaves 7’-15’ long, 
with 9-28 short stalked, ovate-lanceolate leaflets which are 
21,’-5’ in length by 14’-114’ in width. The leaflets are dark 
yellow green, glabrous or pubescent along the midribs, finely 
serrate, somewhat curved with a rounded base. Fruit globose 
to oblong 14’ to 144’ 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 
erows well in localities outside its natural range. 
3. dJuglans Californica Wats. Jalifornia Walnut. <A 
stately forest tree reaching 60° in height by 18’-20’ in diam- 
