798 



Yearbook^ of Agriculture 1949 



107. Bur oak. 



2 r 2 



108. Overcup oak. 109. Post oak. 



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110. White oak. 



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brown, orange, or red in fall. Acorns usually in pairs on stalks 1 YZ to 3 inches long, ^4 to 

 1 54 inches long, one-third enclosed by the deep cup. 

 Principal uses: White oak lumber. 



BB. Leaf edges deeply lobed. 



107. BUR OAK, Quercus macrocarpa Michx. (mossycup oak). 



Large tree of eastern half of United States west to Montana and in adjacent Canada 

 west to Saskatchewan. Bark light brown, deeply furrowed into scaly ridges. Leaves oblong, 

 4 to 10 inches long, wedge-shaped at base, broadest above middle, the lower part deeply 

 lobed nearly to middle and the upper half with shallow lobes, dark green and usually shiny 

 above, grayish or whitish hairy beneath, turning yellow or brown in fall. Acorns usually 

 large, ^4 to 2 inches long, broad, half enclosed by the large cup with fringelike border. 



Principal uses: Lumber and railroad ties. Shelterbelts. Shade tree and ornamental. 



108. OVERGUP OAK, Quercus lyrata Walt, (swamp white oak; white oak [lumber]). 

 Medium-sized to large tree of Atlantic coast, Gulf coast, and Mississippi Valley regions. 



Bark brownish gray, fissured into large irregular, scaly ridges. Leaves oblong, 6 to 8 inches 

 long, wedge-shaped at base, deeply lobed nearly to middle with 7 to 9 rounded or 

 pointed lobes, the 2 lowest lobes on each side much smaller, dark green and smooth above, 

 white hairy beneath, turning yellowish, orange, or scarlet in fall. Acorns ^2 to 1 inch long, 

 nearly enclosed by the spherical deep cup with ragged edge. 

 Principal uses: White oak lumber. 



109. POST OAK, Quercus stellata Wangenh. 



Small to medium-sized (rarely large) tree of eastern half of United States except 

 northern border. Bark reddish brown, fissured into broad, scaly ridges. Leaves oblong, 4 

 to 8 inches long, usually wedge-shaped at base, deeply 5- to 7 -lobed (3-lobed in a variety), 

 the lobes broad and middle lobes largest, dark green and rough above, grayish hairy beneath, 

 turning brown in fall. Acorns J/a to 1 inch long, nearly half enclosed by the deep cup. 



Principal uses : Railroad ties and construction timbers. 



110. WHITE OAK, Quercus alba L. 



Large tree of eastern half of United States and adjacent Canada. Bark light gray, 

 fissured into scaly ridges. Leaves oblong, 4 to 9 inches long, deeply or shallowly 5- to 

 9-lobed, smooth, bright green above, pale or whitish beneath, turning deep red in 

 fall. Acorns $4 to 1 mcn long, with shallow cup. 



Principal uses: The most important lumber tree of the white oak group and one of 

 the best oaks with high-grade all-purpose wood. The outstanding wood for tight barrels. 

 Shade tree. (State tree of Connecticut, Maryland, and West Virginia.) 



