48 
MANUAL OF NATURE STUDY. 
finally black. The black walnut is known by its 
minutely down}r stalks and shoots, and smoothish 
serrate leaflets. Also by its large, round fruit, 
from which the dried shuck does not fall away. 
Bark is very rough and deeply furrowed, even 
more so than the elm. 
The butternut is known by its oblong, sticky 
fruit and sticky leaves. The fruit is about twice 
as long as thick, and is held within a persistent 
shuck similar to the black walnut in that respect. 
The fruit of both black and white walnut is deeply 
furrowed. Why? 
The hickory is represented by several species. 
The shell-barked hickory is well known by its 
shaggy, hard bark, which almost invariably shells 
from below upward. Its compound leaf has five 
leaflets, the three upper much larger, and lance- 
ovate in shape. The nut is white and grows within 
a shuck, which easily falls away upon ripening. 
The large shell-bark has seven to nine leaflets, 
which are more downy beneath than those of the 
common shell-bark. The nuts are yellowish in 
color and much larger and thicker shelled than 
the common shell-bark. The fruit of both these 
shell-barks is edible. 
The pig nut is known by its rough, not scaly, 
bark, smooth leaves, leaflets five to seven, obovate, 
lanceolate, fruit bitterish. 
