QUERCUS 



265 



producing in open grown trees an irregular and widely spreading crown, in 

 dense forest often with a tall straight trunk and short branches ; bark dark 

 grayish brown, rough, heavily ridged and fissured, the twigs and smaller 

 branches often with prominent corky wings; buds rounded, pubescent, 

 about 2-3 mm. long; .leaves crowded at the extremities of the twigs, very 

 variable in shape, irregularly round lobed, usually most deeply lobed about 

 the middle, broadest and much less deeply lobed above the middle, on 

 seme trees very slightly lobed, on others cut almost to the midrib, tip 

 rounded, base wedge-shaped ; when young densely woolly, at maturity 



Quercui rnacrorarpa 



smooth, glossy, dark green above, paler below and pubescent with stellate 

 hairs, turning brown in autumn and promptly deciduous, 7-18 cm. long, 

 4-12 cm. wide, petioles 5 mm. -2 cm. long; flowers appearing with the 

 leaves, opening when the latter are about one- fourth grown, staminate 

 catkins 4-6 cm. long, hairy, flowers about 1.5 mm. in diameter, pistillate 

 flowers usually in pairs, sessile or short peduncled; acorns ripening the 

 first season, sessile or borne on stout peduncles seldom over 1 cm. long in 

 Minnesota specimens, acorn round or oval, 12-25 mm. long, pale brown, 

 slightly downy above, cup deep, sometimes nearly covering the acorn, 

 pubescent, its scales closely appressed, but the upper ones ending in fine 



