376 CLASS XXI. ORDER VIII. 



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

 easy to split, and in point oi' durability approaches the white oak. 



duERCus TiNCTORiA. Bartraiu. Black Oak. 



Leaves slightly lobed, the lobes angular; cnp some- 

 what saucer shaped, acorn depressed-globular. Mick, 

 sub. V. angiilusa. 



The black oak grows to a large size, and is uniformly charac- 

 terized by the rough and very dark colored 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 mucro- 

 nated teeth and angles. Tlieir base is obtuse, and their under 

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

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

 Acorn short and round, with its summit depressed. 



The bark of this oak furnishes the Quercitron used in dying. 

 It is also one of the best species used in the tanning of leather. 

 The wood is much inferior to that of the white oak, but is often 

 used as a cheaper substitute. 



Q.UERCUS cocciNEA. Wang. Scarlet Oak. 



Leaves on long petioles, oblong, deeply sinuate, 

 glabrous, the lobes toothed, acute; cup very scaly; 

 acorn short, ovate. Mich. f. 



A large species of oak. The leaves are divided into long, acute 

 lobes, by very deep and large sinuses ; the lobes ending in nar- 

 row teeth, which are mucronated with long, bristle shaped points. 

 Both sides of the leaves are of a bright, shining green. The 

 acorn is short and ovate, contained in a cup with prominent 

 scales, and tapering at base. Tiie wood of this species, as well 

 as of the next, is more open and porous, also less durable, than 

 that of the white oak. 



Qekcus rubra, h. Red Oak. 



Leaves on long petioles, glabrous, obtusely sinuate; 

 cup saucer shaped, nearly smooth ; acorn nearly 

 ovate. Midi. f. 



The red oak is one of the largest of its genus. Its leaves are 



