CLASS XXI. ORDER VIII. 379 



color, carinated on both sides, sharp pointed, its whole surface 

 roughened by deep indentures and sharp prominences. The 

 kernel is more regular than in most nuts of its kind, is very oily, 

 pleasant to the taste when fresh, but acquires a rancid taste by 

 age. 



The wood is lighter and weaker than that of the Hickories, 

 but is said to be durable. The sap affords sugar, and an extract 

 made from the bark is in great estimation as a laxative medicine. 



§ Subgenus Carta. Aments in threes, ivith three parted scales, 

 and no corolla. Pericarp four valved. Hickory. 



JuGLANS ALBA. WUld. White Walnut. Common Hickory. 



Leafets seven, oblong-lanceolate, acuminate, ser- 

 rate, pubescent and rough imderneath, the odd one 

 sessile; fruit somewhat four angled, smooth. Willd. 

 Syn. JuGLANS TOMENTOSA. Mich. ct f. 



The trunk of this walnut, in young trees, is covered with a 

 smooth bark; in old trees the bark becomes cracked, rugged, 

 and thick, but never scaly. The buds in winter are large, hard, 

 and of a greyish white. The leaves are pinnate, with seven or 

 nine large leafets, which are serrate and acuminate, nearly ses- 

 sile, their under side and common stalk hairy. The barren 

 flowers are in long, pendulous, downy aments, connected three 

 together, with a pair of acuminate bractes, connate on one side, 

 at their junction ; calyx scales three parted, the middle segment 

 acute, the lateral ones obtuse or toothed ; anthers oval brownish, 

 from six to eight. Fertile flowers on the ends of the branches ; 

 calyx of four acute, downy leaves. The nut is hard, thick 

 shelled, commonly with four prominent angles, the kernel toler- 

 ably good, the green shell rather thick, opening two thirds of its 

 length in autumn, when the fruit is ripe. 



JuGLANS GLABRA. MuM. Pig Nut. Hog Nut. 



Leafets seven, ovate, acuminate, serrate, glabrous 

 on both sides, with resinous dots underneath, the odd 

 one sessile ; fruit and nut oblong or obcordate. 



