JUGLANDACE2E 133 



Bark closely furrowed, rarely exfoliating in plate-like scales. 



Leaflets 7-0, oblong-lanceolate to obovate-lanceolate, more or less tomentose on the 

 lower surface, very fragrant ; nut globose or oblong, often long-pointed, 4-ridged 

 toward the apex, thick-shelled, reddish brown. U. H. alba (A, C). 



Leaflets usually 5-7, oblong to obovate-lauceolate, glabrous or villous-pubeaeent ; 

 fruit pyriform or globose ; husk usually thin, slightly ridged at the sutures ; nut 

 oblong-oval or globose, thick or thin-shelled. 10. H. glabra (A, C). 



Leaflets 5-0, lanceolate to oblanceolate, pubescent and covered below while young 

 with silvery peltate scales ; fruit subglobose to pyriform ; husk thin ; nut angled, 

 thick-shelled. 1 1. H. villosa (A, C). 



1. Bud-scales few, valvate. 



1. Hicoria Pecan, Britt. Pecan. 



Leaves 12'-20' long, with slender glabrous or pubescent petioles, and 9-17 

 lanceolate to oblong-lanceolate more or less falcate long-pointed coarsely often 

 doubly serrate leaflets rounded or wedge-shaped at the unequal base, sessile, with 

 the exception of the terminal leaflet, or short-stalked, thin and firm, dark yellow- 

 green and glabrous or pilose above, and pale and glabrous or pubescent below, 



4'-8' long, 1/-3' wide, with narrow yellow midribs and conspicuous veins. Flowers: 

 staminate in slender puberulous clustered aments 3'-5' long, from buds formed in 

 the axils of leaves of the previous year or occasionally on shoots of the year, sessile 

 or short-stalked; calyx light yellow-green and hirsute on the outer surface, with 

 broadly ovate acute lobes rather shorter than the oblong or obovate bract, and nearly 

 sessile yellow anthers; pistillate oblong, narrowed at the ends, slightly 4-angled and 

 coated with yellow scurfy pubescence. Fruit in clusters of 311, pointed, 4-winged 

 and angled, l'-2^' long, ^'-1' broad, dark brown and coated with clusters of yellow 

 articulate hairs, with a thin hard and brittle husk splitting at maturity nearly to the 

 base and often persistent on the branch during the winter after the discharge of 

 the nut; nut ovoid to ellipsoidal, nearly cylindrical or slightly 4-angled toward the 

 pointed apex, rounded and usually apiculate at the base, bright reddish brown, with 

 irregular black markings, l'-2' long, with thin brittle walls and papery partitions; 



