Quercus 



1221 



Leaves, lower surface pilose on the midrib and veins, elsewhere glabrous ; 

 with twelve to fifteen pairs of regular triangular teeth ; 4 to 6 in. long, 3 to 

 3^ in. wide ; subsessile, petiole not exceeding in. 



$ Leaves lanceolate. 



35. Quercus Muehlenbergii, Engelmann. North America. Seep. 13 10. 



Leaves narrower than in Q. Prinus, 6 in. long, 2 in. wide, with eight to 

 fifteen pairs of inflexed, rounded or acute teeth ; with a minute pubescence 

 beneath, often disappearing in summer ; petiole f to 1^ in. long. 



(b) Leaves irregularly toothed, or with conspicuous lobes and deep sinuses. 

 f Leaves quite glabrous beneath. 



36. Quercus obtusata, Humboldt and Bonpland. Mexico. See p. 1312. 



Leaves subevergreen, falling in March, obovate, 4 to 5 in. long, narrowed 

 and auricled at the base, margin with irregular callous-tipped teeth ; petiole 

 i to f in. 



37. Quercus pedunculata, Ehrhart. Europe. See Vol. II. p. 282. 



Leaves deciduous in autumn, obovate, auricled at the base, with four to six 

 pairs of mostly entire irregular lobes ; 3 to 6 in. long ; lateral nerves ending 

 both in the lobes and in the sinuses ; petiole usually less than \ in. 



ft Leaves pubescent beneath. 



38. Quercus sessiliflora, Salisbury. Europe. See Vol. II. p. 291. 



Leaves obovate, cuneate at the base, with four to six pairs of mostly entire 

 irregular lobes ; nerves ending in the lobes ; 3 to 5 in. long ; lower surface 

 green with scattered pubescence, densest on the midrib and nerves ; petiole 

 I to 1 in. long. 



39. Quercus alba, Linnaeus. North America. See p. 1301. 



Leaves obovate, cuneate at the base, with seven to nine irregular, mostly 

 entire lobes ; upper lateral lobes smaller than those in the middle ; lower surface 

 pale or glaucous, uniformly covered with a very minute pubescence ; 5 to 7 in. 

 long ; petiole \ in. long. 



40. Quercus lyrata, Linnaeus. United States. See p. 1303. 



Leaves obovate, cuneate at the base, with five to nine irregular triangular 

 lobes, the upper two lateral lobes broad and emarginate and larger than the lower 

 lobes ; lower surface pale, with a minute pubescence throughout ; 7 to 8 in. 



long ; petiole \ to f in. 



** Branchlets pubescent. 



(a) Terminal and axillary buds surrounded by persistent stipules. 



41. Quercus Cerris, Linnaeus. Southern Europe, Asia Minor. Seep. 1254. 



Leaves oblong or oval, about 5 in. long, with seven or eight pairs of entire 

 or toothed lobes ; lower surface green or greyish, covered with a minute stellate 

 pubescence. 



42. Quercus macranthera, Fischer and Meyer. Caucasus, north Persia. See 



p. 1322. 

 Leaves obovate, 4 to 5 in. long, with seven to eleven pairs of short, usually 

 entire lobes ; lower surface densely tomentose. 





