42 DEPARTMENT BULLETIN 863, U. S. DEPT. OF AGRICULTURE. 



VI. LEAVES COMPOUND, ALTERNATELY ATTACHED TO TWIGS. 



A. Leaflets small, many, attached along two sides of a main stem. Fruit, a 



flat, bean-like, dry or fleshy pod. 



(1) Leaflets with small, wavy teeth. Pods flat, broad, long, often 



twisted, thin-skinned, with thick, cheesy, sweetish pulp about 

 seeds. Trees with long, keen, branched thorns. 



(Gleditsia) Honey locust. 



(2) Leaflets not toothed. 



(a) Twigs with pairs of short, keen thorns. Leaflets rounded at 

 ends. Flowers showy white, in large clusters. Pods small, 

 flat" thin, dry, with small seeds (Robinia) Black locust. 



(7>) Twigs thornless. Leaflets oval, pointed. Flowers greenish, 

 with violet odor. Pods large, flat, thick, with jelly-like 

 pulp (poisonous) around the large, black-brown seeds. 



(Gymnocladus) Coffee tree. 



B. Leaflets large. Fruit, a hard-shelled nut, with a separable husk. 



(1) Leaflets narrow at base becoming larger at outer end. But light- 



colored, in a husk' which separates more or less completely into 

 four parts when ripe (Hicoria) Hickory. 



(2) Leaflets broad at base, becoming narrower at outer end. Nut dark, 



rough, in a fleshy husk which is inseparable by any natural 

 'divisions and turns black when old. Pith of twigs forms numer- 

 ous cross-partitions (Juglans) Walnut. 



VII. LEAVES COMPOUND, OPPOSITE ON TWIGS. 



A. Leaflets arranged along two sides of a main leafstalk, with a leaflet at the 



end. 



(1) Leaflets generally 3 (sometimes 5), toothed only near the ends. 



Fruit, a cluster of dry, winged seeds, arranged in pairs like those 

 of maple (Acer) Boxelder. 4 



(2) Leaflets generally more than 3 (3 to 11), and either not toothed 



or with small teeth. Fruit, a cluster of a single-winged, dry, 

 oar-shaped "seeds" (Fraxinus) Ash. 



B. Leaflets (5 to 9) clustered at end of a main leaf-stem. Fruit, a shiny, brown 



nut in a thick, warty or prickly husk, which separates into several 

 parts (^Esculus) Buckeye. 



ONE HUNDRED IMPORTANT FOREST TREES. 3 



* Boxelder, a true maple, differs from the others in having compound leaves. 



5 Eastern half of United States. Most of these are important as commercial timber 

 trees ; a few, however, are small sized and included because of their botanical importance 

 and wide occurrence in mixture with timber trees, particularly in second-growth forests. 



Some species are known by more than one scientific name because of lack of agree- 

 ment among botanists. The first name given is to be preferred. 



