QUERCUS 



259 



straight, limbs spreading not gnarled, bark of limbs and small trunks 

 smooth, gray, of large trunks fissured and with broad flat-topped ridges, 

 grayish brown ; buds thick, pointed at the top, narrowed at the base, 5 mm. 

 long, 3 mm. wide, smooth except at the top; leaves lobed about half way 

 to the midrib into several broad triangular acute, bristle-pointed lobes, 

 each lobe having usually two or three narrow bristle-tipped teeth near its 

 outer end, leaf widest about the middle, tip acute, bristle pointed, base 

 rounded or broadly wedge-shaped ; leaves covered with a light down when 



Quercusi rubra 



Quercub ueluTir?a 



young, smooth at maturity or with small tufts of brownish hairs in the 

 axils of the large veins beneath, dull dark green above, paler beneath, 

 turning red in autumn, 10-18 cm. long, 7-16 cm. wide, petioles 2-4 cm. 

 long ; flowers opening when the leaves are about half grown ; staminate 

 catkins slender, almost smooth, 4-10 cm. long, flowers scattered, about 

 3 mm. in diameter ; acorns ripening the second year, borne on stalks about 

 5 mm. long; acorn broad-based, 2-3 cm. long, 1.5-2 cm. wide, dark brown, 

 downy, seed very astringent ; acorn cup flat, saucer-shaped, covering 



