Quercus Fagaceae 389 



Blades mostly 3-7-lobed, the lobes irregular and more or less strongly falcate. 



Pubescence of lower surface of blades whitish; blades of leaves from the lower 



branches not conspicuously different from those of the upper branches 



17. Q. falcata. 



Pubescence of the lower surface of blades brownish; leaves of the lower branches 

 conspicuously different from those of the upper ones, those of the upper 

 branches broader at the apex than those of the next variety; leaves of the 



lower branches slightly obovate, and usually 7-lobed 



17b. Q. falcata var. leucophylla. 



Blades mostly 5-11-lobed, the lobes more regular and mostly acute, the blades mostly 

 12-25 cm long and 8-15 cm wide, usually very much less falcate than those of 



the species; pubescence of lower surface of leaves whitish to grayish 



17c. Q. falcata var. pagodaefolia. 



17. Quercus falcata Michx. Southern Red Oak. In 1910, for four 

 days I followed timber cutters who were making ties in Posey County. 

 They favored me by cutting trees of this species which I had marked. 

 This gave me the opportunity to study the leaves of the trees from the 

 bottom to the top. This study convinced me that the species is polymorphic 

 as to leaf form. I have found no difference in the fruit of the many forms. 

 It is true that the three-lobed form (f. triloba) is the prevailing form on 

 high ground and on sandy ridges. 



This oak is restricted to the southern part of the state. In Clark and 

 Jefferson Counties it is locally frequent in the "flats" where it is usually 

 associated with beech, sweet gum, and black gum. In Harrison and Wash- 

 ington Counties I found it on high ground associated with black and post 

 oaks. In the western part of Gibson and Posey Counties it becomes fre 

 quent and it is associated with the low ground oaks and hickories. 



Along the Atlantic coast from Pa. to Fla., along the Gulf States to 

 Tex. and up the Mississippi Valley and Ohio River Valley to s. Ind., Ohio, 

 and W. Va. 



17a. Quercus falcata f. triloba (Michx.) Palmer & Steyermark. This 

 form is rare and is restricted to sandy ridges and dry soil. It is to be noted 

 that all of the coppice shoots of Quercus falcata I have ever seen have 

 obovate, 3-lobed leaves. 



17b. Quercus falcata var. leucophylla (Ashe) Palmer & Steyermark. 

 Palmer designates my no. 10339 from Posey County as belonging to this 



variety. 



Va. to Fla., through the Gulf States to e. Tex., and northw. to Ark. 



and Ind. , . , 



17c. Quercus falcata var. pagodaefolia Ell. This variety grows on low 

 banks and in low land in close proximity to sloughs, bayous, and ponds in 

 Gibson and Posey Counties. 



Md. to n. Fla., westw. to Ark., and northw. in the Mississippi Valley 



to Ind. 



18. Quercus marilandica Muench. Blackjack Oak. Map 797. Local 

 and infrequent, mostly in the southwestern part of the state where it is 

 found in poor soil on the crests of ridges or in very poor soil on sand 



