DECIDUOUS TREES. 89 
Carya arpa (Shell-bark or Shay-bark Hickory)—Leat- 
lets five, slightly downy on under side, obovate lanceolate, 
serratures small; nut medium size, as shown in fig, 28— 
Fig. 2%. Fig. 28. 
sometimes large; surface uneven, white; shell thin; ker- 
nel large; an excellent, well-known tree; grows to a large 
size; bark rough, shell-like; wood tough, very valuable ; 
common in the Eastern States, and in some localities at the 
Northwest. 
Carya sutcata (Thick Shell-bark Hickory).—Leaflets 
seven to nine, in form like the preceding ; nut prominently 
ribbed, slightly flattened, of a yellowish color, and quite a 
thick shell; kernel sweet and good ; common in Kentucky 
and Illinois; tree of large growth; wood tough and yal- 
uable. 
Carya TOMENTOSA (Mocker-nut, White-heart Hickory).— 
Leaflets seven to nine, oblong, sometimes nearly lanceolate, 
slightly serrate, rough underneath; nut globular, nearly 
smooth, sometimes slightly ribbed ; shell very thick, of a 
brownish color; kernel small, sweet ; tree of large size, 
with a rough furrowed bark on old trees, but quite smooth 
