65. Fagaceae 147 



ovoid, 1-2 cm long-, about 1 cm in diameter; cup 

 one-third to one-half as long as the acorn, nearly 

 sessile; upland woods, common in the s. part of 

 the state, but extending northward to Hancock, 

 McDonough. Mason, Coles, and Clark counties. 



Post Oak Q. stellala Wang. 



13. Young twigs glabrous or nearly so; lower surface of 



leaves whitish-tomentulose; mature acorns 2-3.5 



cm long, the cup 2-5 cm in diameter, short- 



peduncled. 



14. Upper scales of acorn-cup caudate-acuminate, 



forming a fringe around the acorn, which is 



half immersed in the cup; leaf-buds acutish, the 



terminal 5-8 mm long; vigorous 1 -year-old 



twigs sometimes with corky ridges; bottomland 



and upland woods, chiefly in calcareous or 



neutral soils, common. Bur Oak. State tree of 



111 ..Q. macrocarpa Michx. 



14. Scales broad, not caudate-acuminate; acorn 

 nearly or quite immersed in the cup; buds 

 obtuse, the terminal 2-4 mm long; swamps 

 and bottomland woods in the southern third 

 of the state, n. to Jasper and Adams counties. 

 Overcup Oak Q. lyrata Walt. 



1 . Leaves angularly dentate, coarsely toothed or merely undu- 

 late, but not at all or only slightly lobed. (Chestnut Oaks.) 



15. Leaves elliptical or lanceolate, glossy dark green above, 

 more or less whitish stellate-tomentulose beneath, with 

 8-13 pairs of lateral veins, each vein ending in an 

 acutish, mucronate, often incurved tooth ; acorns near- 

 ly sessile, or short-peduncled, 10-18 mm long; hillsides 

 and wooded blufTs, common. Chinquapin Oak. [Q. 

 acuyninata (Michx.) Houba] ..-.Q. tnu hhnbrrgii Ens^elm. 



15. Leaves obovate, cuneate toward the base, angularly 

 shallowly coarsely dentate; acorns 2-3 cm long. 



16. Leaves regularly obtusely dentate; lateral \eins 9-12 

 pairs; fruit sessile or short-peduncled, the pedun- 

 cles less than 1 cm long; bottomlands and borders 

 of streams, s. 111. Swamp C^liestnut Oak. Cow- 

 Oak. Basket Oak. [Q. prinus sensu autfi., non L.] 

 Q. rnichauxii Nutt. 



16. Leaves undulate-crenate or coarsely sinuate. 



17. Lateral \cins 10-16 pairs; fruit sessile or nearly 

 so; hillsides and crests of ridges in Alexander 

 and Union counties. Chestnut Oak. [Q. mon- 

 tana Willd.J Q. prinus L. 



