384 



Fagaceae 



Quercus 



50 



Map 787 



Quercus macrocarpa Michx 



50 



Map 788 



Quercus I y rat a Walt. 



Buhl (Bull. Chicago Acad. Sci. 5: 10. 1934), in his Supplement to Pepoon, 

 Flora of the Chicago Region, deletes these reports. 



Mass. to Ind. and s. Iowa, southw. to Fla., Okla., and Tex. 



8. Quercus macrocarpa Michx. Bur Oak. Mossycup Oak. Map 787. 

 Doubtless occurring in every county of the state, although it may be very 

 rare in some of the hilly counties of the unglaciated area. This species is 

 generally found in wet places in woods and along streams. It is a pioneer 

 tree in the prairie counties where it grows both in low ground and on high 

 ground and even on sandy ridges. In the prairie area it sometimes forms 

 pure stands. I have noted it as a common tree in areas that undoubtedly 

 were formerly prairies in Kosciusko, Lagrange, Noble, and Steuben 

 Counties. 



N. S. to Man., southw. to Ga., Tex., and Wyo. 



8a. Quercus macrocarpa var. olivaeformis (Michx. f.) Gray. This 

 variety is distinguished from the typical form by its shallow cup and 

 the long, oval nut which is often 3 cm long. The cup is semi-hemispheric 

 and encloses the nut for about half its length. It is rare. I have speci- 

 mens from Wells County, and it has been reported from Gibson and 

 Hamilton Counties. 



X Quercus Hillii Trelease. This is believed to be a hybrid between Qn< r- 

 cus macrocarpa and Quercus Muhlenbergii. A single tree was found by Hill 

 near Roby, Indiana. I report this on the authority of Sargent. I have a 

 duplicate specimen but I believe it is only a specimen of the bur oak. I 

 question the determination of this specimen because the last named parent 

 of the hybrid does not occur there or, if it does, it is extremely rare. 



9. Quercus lyrata Walt. Overcup Oak. Map 788. This species is very 

 local in the southwestern counties where it grows about river sloughs and 

 in swamps and low, wet woods. Its habitat is usually inundated each -year. 

 I have not seen it common except in a low woods along Prairie Creek about 

 5 miles northwest of Montgomery in Daviess County. Here it is associated 



