142 TREES OF THE NORTHERN UNITED SIATES 
*Bark shaggy and scaly; kernel very good. (A.) 
A. Leaflets usually § (5 to 7). 20... 1. ccc eee e ceca cen eneeee 1 
A. Leatete: t 10:9 ows at iakwn sack iaeaugawocsgueoanienns 2. 
* Bark rough, deeply furrowed but not shaggy; kernel edible. (B.) 
By, Leaflets. 7 to 9) Wswally Vs... iccscosviee dave cose Besiiwieeewesinasis 3. 
B. Leaflets 5 to 7, usually 5........cccceccscccccscenecsecene: 4, 
* Bark smooth; kernel bitter. (C.) 
C. Leaflets 5 to 7, usually 7, smooth............eceeeeeeeeeeee 5. 
C. Leaflets 7 to 11, serrate with deep teeth...............2.6-- 6. 
* Bark smooth ; nut thin-shelled; kernel sweet; leaflets 13 to 15..7. 
1, Caérya alba, Nutt. (SHELLBARK OR 
SHAGBARK HicKxory.) Leaflets 5, the 
lower pair much smaller, all oblong-lan- 
ceolate, taper-pointed, finely serrate, 
downy beneath when young. Fruit glob- 
ular, depressed at the top, splitting read- 
ily into 4 wholly separate valves. Nut 
white, sweet, compressed, 4-angled. 
Husk quite thin forthe Hickories. Tree 
70 to 90 ft. high, with very shaggy bark, 
even on quite small trees. Wild through- 
out, and cultivated. 
2. Carya sulcata, Nutt. (Bie 
SHELLBARK. Kinenut.) Leaflets 
7 to 9, obovate-acuminate, sharply 
serrate, the odd one attenuate at base 
and nearly sessile; downy beneath 
(more so than Carya alba). Fruit 
large, oval, 4-ribbed above the mid- 
dle, with 4 intervening depressions. 
Husk very thick, entirely separating 
into 4 valves. Nut large, 14 to 2° 
in. long, Gull-whitish, thick-shelled, 
usually strongly pointed at both 
ends. Kernel sweet and good. Tree 
60 to 90 ft. high, with a shaggy bark 
of loose, narrow strips on large 
trees. Quite common west of the 
Alleghanies. 
3. Cadrya tomentésa, Nutt. (MocKERNUT. WHITE-HEART HIcK- 
oRY.) Leaflets 7 to 9 (mostly 7), lance-obovate, pointed, obscurely 
