TREES OF NORTH AMERICA 



macrocarpa and Q. stellata and evidently a hybrid of these species, occurs at Fredericksburg 

 Junction in the valley of the Guadalupe River, Kendall County, Texas. 



X Quercus Hillii Trel., believed to be a hybrid of Quercus macrocarpa and Q. Muehlen- 

 bergii, has been found at Roby, Lake County, Indiana, and near Independence, Jackson 

 County, Missouri. 



43. Quercus lyrata Walt. Overcup Oak. Swamp White Oak. 



Leaves oblong-obovate, gradually narrowed and cuneate at base, divided into spread- 

 ing or ascending lobes by deep or shallow sinuses rounded, straight, or oblique on the 

 bottom, the terminal lobe oblong-ovate, usually broad, acute or acuminate at the elon- 



Fig. 268 



gated apex, and furnished with 2 small entire nearly triangular lateral lobes, the upper 

 lateral lobes broad, more or less emarginate, or acuminate and entire or slightly lobed and 

 much longer than the acute or rounded lower lobes, when they unfold bronze-green and 

 pilose above with caducous hairs, and coated below with thick pale tomentum, at matur- 

 ity thin and firm, dark green and glabrous above, silvery white and thickly coated with 

 pale pubescence, or green and often nearly glabrous below, 7 '-10' long, l'-4' wide; turn- 

 ing yellow or scarlet and orange in the autumn; petioles glabrous or pubescent, '-!' in 

 length. Flowers: staminate in slender hairy aments 4'-6' long; calyx light yellow, coated 

 on the outer surface with pale hairs and divided into acute segments; pistillate sessile or 

 stalked, their involucral scales covered, like the peduncles, with thick pale tomentum. 

 Fruit sessile or borne on slender pubescent peduncles sometimes \\' in length; nut subglo- 

 bose to ovoid or rarely to ovoid-oblong, |'-1' long, usually broader at base than long, light 

 chestnut-brown, more or less covered above the middle with short pale pubescence, en- 

 tirely or for two thirds of its length inclosed in the ovoid, nearly spherical or deep cup- 

 shaped thin cup, bright red-brown and pubescent on the inner surface, hoary-tomen- 

 tose and covered on the outer by ovate united scales produced into acute tips, much 

 thickened and contorted at its base, gradually growing thinner and forming a ragged edge 

 to the thin often irregularly split rim of the cup. 



A tree, rarely 100 high, with a trunk 2-3 in diameter, generally divided 15-20 above 

 the ground into comparatively small often pendulous branches forming a handsome sym- 

 metrical round-topped head, and slender branchlets green more or less tinged with red 

 and pilose or pubescent when they first appear, light or dark orange-color or grayish 

 brown and usually glabrous during their first winter, ultimately becoming ashy gray or 

 light brown. Winter-buds ovoid, obtuse, about f ' long, with light chestnut-brown scales 

 covered, especially near their margins, with loose pale tomentum. Bark f'-l' thick, light 



