TREES OF THE NORTHERN UNITED STATES 



2. Gleditschia aquatica, Marsh. (WA- 

 TER-LOCUST.) Leaflets ovate or oblong. 

 Pods oval, 1 to 4 in. long, 1- to few-seeded, 

 without pulp. A small tree with few slen- 

 der, usually simple thorns; in swamps 

 in southern Dlinois and south. Occa- 

 sionally planted for ornament. This spe- 

 cies is quite similar to the preceding one, 

 but the leaves are somewhat smaller, the 

 thorns, though occasionally branching, 

 do not branch 

 so extensively, 

 and the pod is 

 very short and 

 rounded. 



3. G-leditschia sinensis,Lam. (CHINESE 

 HONEY-LOCUST. ) A tree with stouter and 

 more conical thorns, broader and more oval 

 leaflets. A medium-sized or small tree, 

 often cultivated. This species, like the 

 others, has a thornless variety. 



GENUS 35. ALBIZZIA. 



Trees or shrubs with abruptly pinnate leaves. Fruit 

 a broad-linear straight pod. 



Albizzia julibrissin,Boivin. (SILK- 

 TREE. ) Leaves twice abruptly pinnate, 

 of many (over 400) leaflets; leaflets 

 semi-oblong, curved, entire, acute, 

 with the midrib near the upper edge. 

 Flowers in globose heads forming pan- 

 icles. Fruit plain pods on short stems. 

 A very beautiful small tree, introduced 

 from Japan ; probably not hardy north 

 of Washington. The figure shows only 

 one of the lowest and shortest side 

 divisions (pinnte) of the leaf. The 

 pinna increase in length and number of leaflets to the end of the 

 leaf. 



A. julibrissin. 



