Quercus 



Fagaceae 



381 



50 



Map 780 



Quercus alba L. 



50 



Map 782 



Quercus bicolor Willd. 



Inner bark reddish or gray; nut generally ovoid; scales glossy and 



glabrous or nearly so; kernel white and not very bitter 



16. Q. coccinea. 



Mature leaves more or less pubescent on the whole under surface. 



Leaves drooping, grayish or yellowish pubescent beneath; blades variously lobed, 

 specimens usually having some falcate lobes; rarely specimens with 3-lobed 

 leaves, this form more common on small trees or coppice shoots; scales of 

 cup with a reddish brown border; nut enclosed for about a third of its length. 



17. Q. falcata. 



Leaves brownish or rusty-pubescent beneath, sometimes appearing grayish; 



scales of cup without a dark border; nut enclosed for about half its length. 



Blades expanded at the apex, and generally with only three lobes; mature 



twigs generally scurfy-pubescent 18. Q. marilandica. 



Blades with more than three lobes; mature twigs generally glabrous 



12. Q. velutina. 



1. Quercus alba L. White Oak. Map 780. This species is found in 

 every county of Indiana. Knowing this fact, I have not tried to preserve 

 specimens from every county, but have tried to secure a series of the 

 widely varying forms. The leaves vary greatly in their lobing, especially 

 in the depth to which the blade is cut. We have some specimens in 

 which the width of the blade between the lobes is only 5 mm. In others, 

 the lobes are shallow and the uncut part of the blade is 30-40 mm wide. 

 The lower surface of the blades is glaucous and entirely glabrous at ma- 

 turity. My Starke County specimen, which is pubescent over nearly the 

 entire lower surface, is an exception. The nuts vary from 10-30 mm long. 



It is found throughout the state except in low, wet grounds. 



Maine, s. Ont. and Minn., southw. to Fla. and Tex. 



la. Quercus alba f. latiloba (Sarg.) Palmer & Steyermark. I am in- 

 cluding with the species this form with the blades cut less than half way 

 to the midrib. This form is more abundant in the northern part of the 

 range of the species. 



X Quercus Beadlei Trelease. So named by William Trelease. Probably 

 a hybrid between Quercus alba and Quercus Prinus. I found a large tree 



