SUMMER KEY TO THE SPECIES OF QUERCUS 



a. Leaves deeply cut or lobed. 



b. Leaf-lobes acute, bristle-tipped; fruit maturing in the 

 second season, 

 c. Lower surface of leaves more or less pubescent. 



d. Leaf-lobes usually 7; buds hoary-tomentose ; bark of 

 trunk deeply furrowed and scaly ; inner bark yellow ; 

 cup-scales of acorn hoary -^pubescent ; nut ovoid ; 

 large tree, common in Michigan. . . ,Q. velutina, p. 117. 

 dd. Leaf-lobes usually 3 (at apex of the leaf only) ; buds 

 rusty-h,airy ; bark of trunk divided into nearly square 

 plates; inner bark not yellow; cup-scales of acorn 

 rusty-tomentose ; nut subglobose ; shrubby tree, rare 



in Michigan Q. marilandica, p. 119. 



cc. Lower surface of leaves glabrous or nearly so. 



d. Cup of acorn top-shaped or cup-shaped, inclosing one- 

 third to one-half of the nut. 



e. Kernel of nut yellow; buds glabrous, lustrous, 

 slightly angular; inner bark of trunk yellow; trunk 

 provided with pins or stubs of dead branches near 



the ground . Q. ellipsoidalis, p. 115. 



ee. Kernel of nut whitish ; buds pubescent above the 

 middle, not angular; inner bark of trunk red; trunk 

 not provided with pins or stubs of branches near 



the groun-d Q. coccinea, p. 113. 



dd. Cup of acorn saucer-shaped, inclosing only the base 



of the nut. 



e. Upper surface of leaves usually lustrous, especially 

 on the lower branches; lowermost branches of trees 

 growing in the open drooping nearly to the ground; 



nut about l / 2 inch long Q. palustris, p. HI. 



96 



