280 TREES OF NORTH AMERICA 



31. Quercus Toumeyi Sarg. 



Leaves ovate or ovate-oblong or oval, acute and apiculate at apex, rounded or cordate 

 at base, entire with thickened slightly revolute margins, or remotely spinulose-dentate, 

 often minutely 3-toothed at apex, thin but firm in texture, light blue-green, glabrous and 

 lustrous above, pale and puberulous below, conspicuously reticulate-venulose; \'-\ long, 

 \'-\' wide; falling early in spring with the appearance of the new leaves; petioles stout, 



Fig. 256 



tomentose, about rV m length. Flowers unknown. Fruit sessile, solitary or in pairs, 

 ripening in June; nut oval or ovoid, \'-\' long, \' thick, light brown and lustrous, furnished 

 at the acute apex with a narrow ring of pale pubescence, inclosed for about one half its 

 length in a thin shallow tomentose cup light green and pubescent within, and covered 

 by thin ovate regularly and closely imbricated light red-brown scales ending in a short 

 rounded tip and coated on the back with pale tomentum. 



A tree, 25-30 high, Avith a short trunk 6'-8' in diameter, dividing not far from the 

 ground into numerous stout wide-spreading branches forming a broad irregular head, and 

 slender branchlets bright red-brown more or less thickly coated with pale tomentum at 

 midsummer, covered during their second and third years with thin dark brown nearly black 

 bark broken into small thin closely appressed scales. Wood light brown, with thick pale 

 sapwood. 



Distribution. Forming an open forest on the Mule Mountains, Cochise County, 

 southeastern Arizona. 



32. Quercus arizonica Sarg. White Oak. 



Leaves oblong-lanceolate to broadly obovate, generally acute or sometimes rounded at 

 apex, rounded or cordate at base, repandly spinose-dentate usually, except on vigorous 

 shoots, only above the middle or toward the apex, or entire and sometimes undulate on 

 the margins, when they unfold light red clothed with bright fulvous tomentum and furnished 

 with dark dental glands, at maturity thick, firm and rigid, dull dark blue-green and glabrate 

 above, duller and covered with thick fulvous or pale pubescence below, l'-4' long, -|'-2' 

 wide, with a broad yellow midrib, slender primary veins, arcuate and united near the thick- 

 ened revolute margins, and coarsely reticulate veinlets; falling in the early spring just be- 

 fore the appearance of the new leaves; petioles stout, tomentose, \'-\' in length. Flowers: 

 staminate in tomentose aments 2'-3' long; calyx pale yellow, ^pubescent, and divided into 

 4-7 broad acute ciliate lobes; anthers red or yellow; pistillate on short stems tomentose 

 like their involucral scales. Fruit sessile or on hoary-tomentose stems rarely \' long, usu- 

 ally solitary, ripening irregularly from September to November; nut oblong, oval or slightly 



