142 



TREES OF THE NORTHERN UNITED STATES 



*Bark shaggy and scaly; kernel very good. (A.) 

 A. Leaflets usually 5 (5 to 7) 1. 



A. Leaflets 7 to 9 2. 



* Bark rough, deeply furrowed but not shaggy; kernel edible. (B. ) 



B. Leaflets 7 to 9, usually 7 3. 



B. Leaflets 5 to 7, usually 5 4. 



* Bark smooth ; kernel bitter. (C. ) 



C. Leaflets 5 to 7, usually 7, smooth 5. 



C. Leaflets 7 to 11, serrate with deep teeth 6. 



* Bark smooth ; nut thin-shelled ; kernel sweet ; leaflets 13 to 15 . .7. 



1. C&rya &lba, Nutt. ( SHELLBARK OR 

 SHAGBARK HICKORY.) 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 for the 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. (BiG 

 SHELLBARK. KINGNUT.) 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, li to 2 

 in. long, dull-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. Cdrya tomentdsa, Nutt. (MOCKERNTTT. WHITE-HEART HICK- 

 ORY.) Leaflets 7 to 9 (mostly 7), lance-obovate, pointed, obscurely 



