Quercus 



Fagaceae 



385 



o 35 



Map 790 



Quercus boreal is var. 



maxima (Marsh.) Ashe, 



5d 



Map 791 



Quercus velutina Lam, 



with the swamp chestnut oak. In 1931, on the bank of Slim Pond (an 

 old river channel) in Posey County, I measured a specimen that was 56 

 inches in diameter at breast height, and had a clear bole of about 12 feet. 

 Clapp writes he saw it in the vicinity of New Albany. 

 Md. to Iowa, southw. to Fla. and Tex. 



10. Quercus imbricaria Michx. Shingle Oak. Map 789. Found spar- 

 ingly throughout the state. In some places it is very local and in a few 

 areas it is frequent and locally abundant. Usually it is a tree of low ground 

 and in some places in prairie habitats, it seems to be the pioneer tree species. 

 In the Patoka bottoms it is usually a frequent to common tree in ground 

 just a little higher than where the pin oak grows. On high ground it is 

 usually closely associated with the black oak. 



Pa., Mich, to Nebr., southw. to Ga. and Ark. 



X Quercus exacta Trelease. This is believed to be a hybrid between 

 Quercus imbficaria and Quercus palustris. I found a single tree in Posey 

 County. 



X Quercus Leana Nutt. This seems to be a hybrid between Quercus 

 imbricaria and Quercus velutina. I collected it in Lawrence County and 

 Lake County. I also have a specimen collected by Ralph M. Kriebel from 

 a tree in Lawrence County. Recently Kriebel has collected it in Knox 

 County. 



11. Quercus borealis Michx. var. maxima (Marsh.) Ashe. (Quercus 

 rubra of Gray, Man., ed. 7 and Britton and Brown, Illus. Flora, ed. 2.) 

 Red Oak. Map 790. This oak is infrequent to frequent throughout the 

 state and even common in some parts. It may be entirely absent from 

 Benton, Newton, and possibly Lake Counties and is rare or absent in the 

 Lower Wabash Valley. While our map shows no specimens from the 

 southwestern part of the state, there are reports from that part and I 

 have seen it growing there. The paucity of specimens of this and other 

 species of oak is due to the fact that oaks do not produce fruit every 



