96 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 sleu- 
der, usually simple thorns; in swamps 
in southern Illinois and south. Occa- 
sionally planted for ornament. This spe- 
cies is quite similar to the preceding one, 
put the leaves are somewhat smaller, the 
thorns, though occasionally branching, 
do not branch 
so extensively, 
and the pod is 
G. aquatica. very short and 
rounded. 
3. Gleditschia, sinénsis, 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 (pinne) of the leaf. The 
pinve increase in length and number of leaflets to the end of the 
leaf. 
A, jnlibrissin, 
