16 JUGLANDACEAE. 
JUGLANS. Walnut. 
(Family Juglandaceae). 
Usually trees, sometimes of 
large size: deciduous. Twigs 
rather stout, more or less fluted: 
pith moderate, brown, angular, 
chambered with rather close thin 
plates. Buds moderate, with sev- 
eral scales, superposed and often 
developing into catkin rudiments, 
the terminal much larger and 
with more or less lobed scales. 
Leaf-scars alternate, shield-shaped 
or 3-lobed, large, raised: bundle- : 
traces in 3 compound groups: 
stipule-scars lacking. 
{I} BS] Of recent years black walnut 
oe in y\ ‘4 has been planted in some quantity 
y ) AL for its, wood; and the European 
ay) fi = walnut furnishes one of the im- 
Yi 
Mee WY SS 
portant Californian crops, and in 
more hardy forms it is recom- 
mended for other regions. Hy- 
brids are known between the European walnut and the black 
walnut, and Juglans rupestris has been thought (undoubtedly 
wrongly) to hybridize with the Californian live-oak. 
1. Terminal bud elongated: leaf-scar downy at top. 2. 
Terminal bud short: leaf-scar without a downy line. 3. 
2. Leaf-scars not notched at top. (Butternut). (1). J. cinerea. 
Leaf-scars notched: twig very stout. J. Sieboldiana. 
3. Twigs gray-pubescent: buds canescent: pith diaphragms 
close together (18 to 1 cm.). (Black w.). (2). J. nigra. 
Twigs and lateral buds glabrescent: bark smooth: pith 
diaphragms 8 to 1 cm. (European walnut). J. regia. 
