554 



The Locusts 



usually erect, forming an oblong tree. The bark is 2.5 to 4 cm. thick, somewhat 

 porous, deeply furrowed into roundish ridges of a reddish brown color. The twigs 

 are round or nearly so, slightly haiiy at first, soon becoming smooth and brown. 

 The pinnate leaves arc 1.5 to 3 dm. long, consisting of 7 to 19 leaflets and a 



Fig. 511. Locust, Carnot, Pennsylvania. 



grooved stalk 2.5 to 4 cm. long thickened at the base. The leaflets are thin, elhp- 

 tic or ovate, 2.5 to 4.5 cm. long, rounded and often minutely bristle-pointed, the 

 base rounded, the margin entire; their short stalks are about 4 mm. long; they 

 are silver^' white at first, soon becoming dull green and smooth above, paler and 

 smooth beneath, or slightly hairy on the midrib. The stipules are about 12 mm. 



