TREES OF NORTH AMERICA 



terete, about 1' in length. Flowers: staminate in short hoary-tomentose araents; calyx 

 bright yellow, pilose, divided into 5 or 6 laciniately cut or entire acute segments tinged with 

 red above the middle; pistillate usually sessile, or on peduncles tomentose like the involu- 

 cral scales; stigmas bright red. Fruit usually solitary and sessile, rarely long-stalked; nut 

 ovoid, ellipsoidal, or slightly obovoid, full and rounded at apex surrounded by a narrow 

 ring of white pubescence, dark chestnut-brown, striate, and very lustrous, soon becoming 

 light brown in drying, '-f ' long, about ' thick, inclosed for about one third its length in a 

 cup-shaped or rarely turbinate thin cup yellow-green and pubescent on the inner surface 

 and covered by ovate-oblong scales slightly thickened on the back, coated with hoary 

 tomentum antl ending in thin acute bright red tips ciliate on the margins and sometimes 

 forming a minute fringe to the rim of the cup. 



Fig. 258 



A tree, rarely more than 30 high, with a short trunk 18'-20' in diameter, many stout 

 spreading often contorted branches forming a handsome round-topped symmetrical head, 

 and slender rigid branchlets coated at first with pale or fulvous tomentum, light red- 

 brown, dark brown or dark orange color in their first winter, becoming ashy gray in their 

 second or third year. Winter-buds subglobose, T V'-i' long, with thin light chestnut- 

 brown scales. Bark |'-1|' thick, ashy gray, and broken into small nearly square or oblong 

 close plate-like scales. Wood very heavy, hard, strong, brittle, dark brown or nearly black, 

 with thick brown sap wood; sometimes used as fuel. 



Distribution. Chisos Mountains, western Texas, southeastern New Mexico, southern 

 Arizona, and southward into northern Mexico; comparatively rare in Texas; abundant 

 on the foothills of the mountain ranges of southern New Mexico and Arizona at altitudes 

 of about 5000, and dotting the upper slopes of the mesa where narrow canons open to 

 the plain. 



34. Quercus Engelmannii Greene. Evergreen Oak. 



Leaves oblong to obovate, usually obtuse and rounded or sometimes acute at apex, 

 gradually or abruptly cuneate or rounded or cordate at base, entire, often undulate, or 

 sinuate-toothed with occasionally rigid teeth, or at the ends of sterile branches frequently 

 coarsely crenately serrate with incurved teeth, or rarely lobed with acute oblique rounded 

 lobes, when they unfold bright red and coated with thick pale rufous tomentum, at ma- 

 turity thick, dark blue-green and glabrous or covered with fascicled hairs above, pale, 

 usually yellow-green and clothed with light brown pubescence, or puberulous or often 

 glabrous below, l'-3' long, |'-2' wide; deciduous in the spring with the appearance of the 



