JUGLANDACE.E 



171 



Virginia, and on the Appalachian Mountains and their foothills to northern Georgia; in 

 northern Alabama, southern Illinois and western Tennessee; most abundant northward. 



Occasionally cultivated. 



X Juglans quadrangulata A. Rehd., a natural hybrid of J. cinerea and the so-called Eng- 

 lish Walnut (J. regia) is not uncommon in eastern Massachusetts, and a hybrid of /. 

 cinerea with the Japanese J. Sieboldiana Maxm. has appeared in the United States. 



2. Juglans nigra L. Black Walnut. 



Leaves l-2 long, with pubescent petioles, and 15-23 ovate-lanceolate leaflets 3'-3' 

 long, l'-lj' wide, long-pointed, sharply serrate except at the more or less rounded often 

 unequal base, thin, bright yellow-green, lustrous and glabrous above, soft-pubescent 

 below, especially along the slender midrib and primary veins; turning bright clear 

 yellow in the autumn before falling. Flowers: staminate in stout puberulous aments 

 $'-5' long, calyx rotund, 6-lobed, with nearly orbicular lobes concave and pubescent on the 

 outer surface, its bract ' long, nearly triangular, coated with rusty brown or pale 

 tomentum; stamens 20-30, arranged in many series, with nearly sessile purple and trun- 

 cate connectives; pistillate in 2-5 flowered spikes, ovoid, gradually narrowed at the apex, 

 j' long, their bract and bractlets coated below with pale glandular hairs and green and 



Fig. 164 



puberulous above, sometimes irregularly cut into a laciniate border, or reduced to an 

 obscure ring just below the apex of the ovary; calyx-lobes ovate, acute, light green, puber- 

 ulous on the outer, glabrous or pilose on the inner surface; stigmas yellow-green tinged 

 on the margins with red, '-f ' long. Fruit solitary or in pairs, globose, oblong and pointed 

 at apex, or slightly pyriform, light yellow-green, roughened by clusters of short pale artic- 

 ulate hairs, l|'-2' in diameter, with a thick husk; nut oval or oblong, slightly flattened, 

 l'-l^' in diameter, dark brown tinged with red, deeply divided on the outer surface into 

 thin or thick often interrupted irregular ridges, 4-celled at base and slightly 2-celled at the 

 apex; seed sweet, soon becoming rancid. 



A tree, frequently 100 and occasionally 150 high, with a straight trunk often clear of 

 branches for 50-60 and 4-6 in diameter, thick limbs spreading gradually and forming 

 a comparatively narrow shapely round-topped head of mbstly upright rigid branches, and 

 stout branch lets covered at first with pale or rusty matted hairs, dull orange-brown and 

 pilose or puberulous during their first winter, marked by raised conspicuous orange- 

 colored lenticels and elevated pale leaf-scars, gradually growing darker and ultimately 

 light brown. Winter-buds: terminal ovoid, slightly flattened, obliquely rounded at apex, 

 coated with pale silky tomentum, long, with usually 4 obscurely pinnate scales; axillary 



