282 



WISCONSIN AGEICULTQRE. 



4 th. C. olivceiformis — The Pecan-Nut, which is found in the 

 southern part of Illinois. 



Order IX. Cupulifer^. — The Oak Family. 



29. Quercus macrocarpa^ of Midiaux. — Bur- Oak. 



Tlie Bur- Oak is readily 

 known from all other spe- 

 cies in the State by the 

 mossy fi'inge around the 

 border of the acorn cup. 

 The leaves much resemble 

 those of the next species, 

 though usually narrower, 

 and of a much brisjhterand 

 more silvery color below. 

 A verv common tree in the 

 woods, and forming most of 

 the' "openings." When 

 growmg separate from oth- 

 er trees, the branches spread 

 in every direction, forming 

 large rounded heads, and 

 giving these openings the 

 appearance of an over- 

 grown orchard. It is the 

 best of the oak family for 

 BUE-OAK. fuel. 



80. Quercus obiusiloba, of Michaux. — Post Oak. 



The leaves of the Post Oak are downy below, pale and rough 

 above, sinuately cut into five to seven roundish divergent lobes, 

 the upper lobes much the largest, and often with one, two, or 

 three notches. The acorn is ovoid, about twice the length ot the 

 hemispherical cup. This tree is rare in Wisconsin. 



Its durability, when used for posts, has given it the name of 

 Post Oak. The wood is valuable — almost equal, in some re- 

 spects, to the White Oak. 



