44 
MISSOURI BOTANICAL GARDEN. 
ish; nut less deeply grooved. — Coast range of Southern 
California.— PL 24, f. 8-10. 
scales usually not evidently lobed; fruit large, the nut with 
prominent rough and sharp ridges. 
4. J. NIGRA, L.— The Black Walnut.— A largo tree; 
bark dark, deeply fissured and rough ; twigs from densely 
gray tomentose becoming glabrous and reddish-buff, with 
small pale rather inconspicuous lenticels; pith buff, the 
open chambers usually several times as wide as the thin 
diaphragms ; terminal bud mostly globose-conical, often 
almost silverv. — Massachusetts to Ontario and Minnesota, 
south to the'Oulf.- PL 24, f. 11-13. 
The European Walnut, J. regia, commonly cultivated in 
California, and to a less extent in the Atlantic States, 
resembles the last except that its bark is smoother and 
paler, and its twigs redder, often with a decided shade of 
green, mostly more dilated at the nodes and with broader 
more equally 3-lobcd leaf scars, and glabrous, as are the 
lateral buds ultimately. In its typical form, the fruit is 
represented by the rather smooth thin shelled English 
Walnuts of the market. 
Trees with the general characters of i^egia, but the fruit 
more or less resembling nigra, constitute the Juglans inter- 
media of European botanists,* some of whom hold these 
forms to represent hybrids between the two species named, 
while others are disposed to regard them as extreme forms 
of regia. Some years since Professor Roth rock t de^crilKMl 
a very peculiar walnut from the James Riv^r, in Virginia, 
and a somewhat similar fruit has been sent to our herbarium 
from the Wabash bottoms, by Dr. Schneck. More or less 
similar trees have been cultivated in European gardens, 
from American seed.t It is probable that some of these 
* See, for instance, Robinson, Garden, is. 363. 
t Forest Leaves, ii. 133, with figures. 
: See Vilmorin, Garden and Forest, iv. 51, with rl^'ure^; Carriers. 
Eevne Horticole, IStiO, 100, and 18G3, 30. 
