18 
103 Leaflets 15 to 23, not sticky. Fruit globular. Western (5 
N. E. Also cult.—Black Walnut, Walnut, Juglans nigra L. 
Hickory— Leaves compound. Leaflets 5 to 11. Fruit husk 
regularly splitting into 4 parts at maturity. Nut smooth. 
104 Leaflets averaging 5 to 7—105 
104 Leaflets averaging 7 to 11—107 
105 Leaflets usually 5, lowest pair much smaller. Husk of 
fruit more than % inch thick. Kernel of seed sweet. 
Bark of old trunks separating into loose plates. Western 
Me. south and west — Shag-bark Hickory, Shell-bark 
Hickory, Can/a ovatfi (Mill.) lv. Koch. 
105 Leaflets 5 or 7. Husk of fruit less than % inch thick—106 
106 Fruit an inch or more long, oblong. Kernel of seed bitter. 
Bark in close rough scaly ridges. Southern N. E. 
* —Pignut, Brown Hickory, Cai'ya glabra (Mill.) Spach. 
106 Fruitless than an inch in length, globular. Kernel sweet¬ 
ish. Bark rough and somewhat shaggy. Southern N. \ 
E.—Small-fruited Hickory, Small Pignut! Little Shag-bark 
Hickory, Cargo microcarpa Nutt. 
107 Leaflets glandular-hairy, at least beneath, with a resinous 
fragrance when crushed. Fruit husk more than % inch 
thick. Shell of nut thick. Kernel of seed sweet. South¬ 
ern N. E.—Mocker nut, White-heart Hickory, Bull nut. Cargo 
alba (L.) K. Koch. 
107 Leaflets finely hairy only when young. Fruit husk less 
than inch thick. Shell of nut thin. Kernel of seed 
bitter. Southwestern Me. south and west—Bitternut, 
Swamp Hickory, Cargo cord ifor mis (Wang.) K. Koch. 
Birch —Leaves simple, alternate. Fruit clusters cone-like. Nuts 
small, winged. 
108 Bark red, pink, cinnamon, brown, or darker, not separable 
into thin papery layers on old trunks—109 
108 Bark white, yellow, silver} 7 , or bronze, usually more or less 
separable into thin papery layers—110 
