154 



TREES OF THE NORTHERN UNITED STATES 



4. Q,u6rcus lyr&ta, Walt. (SWAMP POST- 

 OAK.) Leaves crowded at the ends of the 

 branchlets, very variable, obovate-oblong, 

 more or less deeply 7- to 9-lobed, white-to- 

 mentose beneath when young, becoming 

 smoothish; the lobes triangular to oblong, 

 acute or obtuse, entire or sparingly toothed. 

 Acorn about % in. long, nearly covered by 

 Q. lyrata. ^he j-Qumj^ ovate, thin, rugged, scaly cup. 



A large tree with pale flaky bark. River-swamps in southern In- 

 diana to Wisconsin, and southward. 



5. Qu6rcus bicolor, Willd. (SWAMP 



WHITE OAK. ) Leaves obovate or oblong- 



obovate, wedge-shaped at base, coarsely 



sinuate-crenate, and often rather pin- 



natifid than toothed, whitish, soft-downy 



beneath. Main primary veins 6 to 8 pairs. 



Acorns, nearly 1 in., oblong-ovoid, set in 



a shallow cup often mossy fringed at the 



margin, on a peduncle about as long as 



the acorn, much longer than the petioles 



of the leaves ; in the axils of the leaves 



of the year. A large tree, 60 to 80 ft. 



high, stem 5 to 8 ft. in diameter. Most 



common in the Northern and Western 

 States, in swamps, but found in moist 

 soil in the mountains of the South. 



6. Quercus Michauxii, Nutt. (BAS- 

 KET-OAK or COW-OAK. ) Leaves 5 to 6 

 in. long, oval to obovate, acute, obtuse, 

 or even cordate at base, regularly but 

 usually not deeply sinuate, rather rigid, 

 usually very tomentose beneath. Acorn 

 large, 1^ in. long, sweet and edible ; 

 cup shallow and roughened with coarse, 

 acute scales ; no fringe. A large and 

 valuable Oak with gray and flaky bark. 



O. Michauxii. 



7. Q,u6rcus Prlnus, L. (CHESTNUT-OAK.) Leaves obovate or 

 oblong, coarsely undulately toothed, with 10 to 16 pairs of straight, 

 prominent ribs beneath ; surface minutely downy beneath, and 

 smooth above. Acorn ovoid, 1 in. long, covered nearly half-way 



