388 



Fagaceae 



Quercus 



out northwestern Indiana and in the northern tier of counties. Hill re- 

 ported it as locally frequent in Lake County, especially near Liverpool. Ac- 

 cording- to Hill, the tree is found on sandy and clayey uplands. Andrews' 

 report from Monroe County may safely be ignored. 



Higgins Lake, Mich, to se. Minn., southw. to nw. Ind. and nw. Mo. 



16. Quercus coccinea Muench. Scarlet Oak. Map 795. This species 

 is local and, no doubt, has a wider range than the map indicates. It is 

 so often confused with the black oak that all records for it must be care- 

 fully checked. It is always intimately associated with black oak and is 

 found in poor soil mostly on the crests of ridges. I believe it has its mass 

 distribution in the unglaciated area, and outside of that it is a rare and 

 local tree. 



Maine, s. Ont. to s. Nebr., southw. to N. C, Ala., and Ark. 



16a. Quercus coccinea var. tuberculata Sarg. This variety differs from 

 the typical form in that the back of the scales is prominently thickened 

 below the middle of the turbinate cup. The upper row of scales is thin 

 and forms a distinct marginal ring. This form has been found in Lawrence 

 and Vanderburgh Counties. 



Mass. to Ind., southw. to Tenn. and Ala. 



17. Quercus falcata Michx. (Quercus rubra of some recent authors 

 and of Sudworth's Check List of the trees of the United States. 1927.) 

 Map 796. All of our forms are shown on one map. The leaves of this 

 species are extremely variable and this fact has led authors to divide 

 it into two species and several forms. Trelease (The American oaks. Mem. 

 Nat. Acad. Sci. 20: 201. 1924) recognized 14 forms of this species. For 

 the benefit of those who wish to try to separate the species into groups 

 1 am giving a brief key for a few of the forms that occur in Indiana. 



Leaves all obovate, usually expanded above the middle into 2 lateral lobes and 1 



terminal, rather rounded lobe 17a. Q. falcata f. triloba. 



Leaves not all obovate, most of them with more than 3 lobes, the lobes mostly acute. 



