138 Proceedings of the Ohio State Academy of Science 



6. Inner bark orange; leaves sometimes lobed to beyond the middle; 

 acorn ovoid, more or less longer than the cup. Q. vehitina. 



6. Inner bark gray or reddish; leaves deeply lobed. 7. 



7. Leaves dull and paler beneath; acorn ovoid. Q. borealis. 



7. Leaves shining on both sides, lobed to near the mid-rib; acorn 



ovoid ; cup J in. wide, more or less. O. cUipsoidalis. 



8. Leaf-lobes lanceolate or linear-lanceolate, long; large trees. 9. 



8. Leaf-lobes triangular-ovate, short; shrubs or low trees. Q. nana. 



9. Leaves rounded or obtuse at the base, -S-o lobed: lobes linear or 



lanceolate, often falcate. Q. digitata. 

 9. Leaves cuneate or acute at the base, o-11-lobed; lobes triangular. 



Q. pagodaefolia. 

 10. Leaves obovate-cuneate, brown-floccose beneath; cup deep, acorn 

 ovoid. Q. marylandica. 



10. Leaves spatulate, glabrous on both sides: cup saucer-shaped, acorn 



globose-ovoid. Q. nigra. 



11. Leaves linear-oblong, green and glabrous on both sides. Q. phcllos. 



11. Leaves oblong or lanceolate, tomentulose beneath. Q. imbricaria. 



12. Leaves pinnatifid or pinnately lobed. 1-3. 



12. Leaves crenate or dentate, not lobed. 17. 



13. Mature leaves pale, or glaucous and glabrous below. 14. 



13. Mature leaves pubescent or tomentose below, lyrate-pinnatifid. 15. 



14. Bark separating in thin scales, light gray or light brown; cup shal- 



low ; bracts thick and warty. Q. alba. 



14. Bark furrowed and ridged, not scaly, dark gray or dark brown; 



cup hemispherical, with imbricated, appressed scales ; cultivated 

 in many varieties. Q. robur. 



15. Upper scales of the cup not awned. 16. 



15. Upper scales awned, forming a fringe around the acorn. O. macro- 



car pa. 



16. Leaves yellowish-brown, tomentulose beneath; acorn ovoid. Q. 



minor. 



16. Leaves white-tomentulose beneath; acorn depressed-globose. Q 



lyrata. 



17. Fruit peduncled ; teeth or shallow lobes of the leaves rounded. 18. 



17. Fruit sessile or nearly so; teeth or shallow lobes of the leaves 



acute. 20. 



18. Peduncle much longer than the petioles; leaves white-tomentulose 



beneath. Q. platanoidcs. 



18. Peduncle as long or shorter than the petioles; leaves gray-tomen- 



tulose beneath. 19. 



19. Bark white, flaky; seed sweet and edible; fruit short peduncled or 



sessile. Q. niichau.rii. 

 19. Bark close; seed edible; petioles slender; peduncles equalling or 

 shorter tlian the petioles. 0. priint.';. 



