140 Proceedings of the Ohio State Academy of Science 



ispheric or top-shaped, acorn ovoid, about twice as long as the 

 cup. Autumn leaves red. In dry soil. Me. to Minn., Fla., Mo., 

 and Ohio. 



5. Quercus ellipsoidalis Hill. Oval-leaf Oiak. A tall 

 tree with gray, close, fissured bark, the innermost layer yellowish ; 

 lowest branches drooping. Leaves oval to obovate-orbicular, 

 2^-6 in. long, deeply 5-7-lobed, broadly cuneate to truncate at 

 the base; cup turbinate, short-peduncled, acorn ellipsoid to sub- 

 globose, \-% in. long, 1-2 times as long as the cup. 111., Mich., and 

 Minn. 



6. Quercus borealis Mx. f. Gray Oak. A large tree with 

 leaves like those of Q. rubra and acorns like those of Q. coccinea. 

 Leaves 7-13-lobed to the middle or somewhat beyond; cup turbi- 

 nate, peduncled; acorn ovoid, 1-2 times as long as the cup. 

 Quebec to Ont., N. Y. and Penn. 



7. Quercus velutina Lam. Quercitron Oak. A large 

 tree of rapid growth with very dark brown outer bark, rough in 

 ridges, and bright orange inner bark. Leaves firm, sometimes 

 lobed to beyond the middle, brown-pubescent or sometimes stel- 

 late-pubescent when young, glabrous when mature, the lobes 

 broad, oblong or triangular-lanceolate; cup hemispheric or top- 

 shaped, commonly narrowed into a short stalk; acorn ovoid, as 

 long or longer than the cup. The inner bark (quercitron) yields 

 a valuable dye ; rich also in tannin. Wood hard, heavy, and 

 strong but not tough. Sparingly self-prunes small twigs by 

 means of basal joints. Me. to Minn., Fla., Neb., Tex., and Ohio. 



8. Quercus digitata (Marsh.) Sudw. Spanish Oak. A 

 tree growing in dry soil. Leaves glabrous above, gray-tomentu- 

 lose beneath, deeply pinnatifid into 3-7 linear or lanceolate lobes ; 

 cup saucer-shaped with a turbinate base, about -| in. broad ; acorn 

 subglobose or depressed, about twice as high as the cup. Wood 

 very hard and strong; used for cooperage. An important tan- 

 bark oak. N. J. to Fla., Mo., Neb., and Tex. 



9. Quercus pagodaefolia (Ell.) Ashe. Swamp Spanish 

 Oak. A tree with spreading branches and dark gray, rough bark. 

 Leaves oval or oblong, cuneate to truncate at the base, 8-12 in. 

 long, deeply 5-11-lobed, persistently white-tomentulose beneath. 



