Class XXI. Order VJIT. 



ly scarce, so that poorer species are often substituted, in the 

 work shops of mechanics. 



QUERCUS BICOLOR. Willd. Swamp white oak* 



Leaves oblong-ovate, downy, white underneath, 

 largely toothed, entire at base, . the teeth unequal 

 and dilated ; fruit on long peduncles. Mich. f. sub 

 syn. 



XI/H. QUERCUS PRJNUS fOMEJTfOSA. Midi. 

 QUERCUS PXINUS DISCOLOR. Mich.f. 



This species grows exclusively in swamps and low grounds. 

 It is often brought to market as fuel, and is easily distinguished 

 by its bark, which separates into large, flat scales or plates. The 

 leaves are inversely ovate or wedge shaped, not sinuated, but 

 bordered with a serpentine line, producing large, obtuse teeth. 

 They are smooth above, but white and downy underneath. The 

 acorns grow in pairs or single, on long stalks. They are large, 

 oval, with a rather small, hemispherical cup. 



The wood of the swamp oak is strong, heavy, and flexible, 

 easy to split, and in point of durability approaches the white 

 oak. 



l-*t iillCUS TINCTORIA. Bcti'll'lDil. Blade OttJc. 



Leaves slightly iobed, the lobes angular ; cup 

 somewhat saucer shaped, acorn depressed-globular. 



Midi, snl) v. anstulosa. 



c_> 



The black oak grows to a large s;/e, and is uniformly char- 

 acterized by the rough, and very dark coloured outer bark of its 

 trunk. The leaves have their sides divided into a number of 

 large, broad, but rather short lobes, furnished with a few mu- 

 cronated teeth and angles. Their base is obtuse, and their un- 

 der surface, while young, is slightly pubescent, or glandular. 

 The cup of the fruit is thick, somewhat turbinated and not deep. 

 Acovn short and round, with its summit depressed. 



