FAGACEJE 



253 



broadly ovate rounded lobes; anthers acute, apiculate, bright red becoming yellow; 

 pistillate mostly solitary, sessile or short-stalked, their iuvolucral scales and calyx- 



lobes thin, scarious, and soft-pubescent; stigmas dark red. Fruit sessile or borne on 

 a stout peduncle ^' long, usually solitary; acorn ovate, acute or rounded at the nar- 

 row hoary-pubescent apex, dark green and often striate when ripe, becoming light 

 chestnut-brown in drying, '-f' long, the shell lined with white tomentum, inclosed 

 for about one third its length in a turbinate thick cup pubescent on the inner sur- 

 face, and covered by thin broadly ovate light chestnut-brown scales rounded at the 

 apex and clothed, especially toward the base of the cup, with soft silvery pubescence. 



A tree, usually 20-30 or sometimes GO high, with a tall trunk 10'- 15' in diame- 

 ter, slender branches spreading into a narrow round-topped inversely conical head, 

 and stout rigid branchlets coated at first with thick hoary tomentum disappearing 

 during the first winter, becoming light red-brown often covered with a glaucous 

 bloom and ultimately nearly black; frequently a shrub. Winter-buds ovate, obtuse, 

 about \' long, with thin light chestnut-brown scales. Bark J'-l' thick, nearly black, 

 deeply divided into broad ridges broken on the surface into thick plate-like scales. 

 "Wood heavy, very strong, hard, close-grained, dark brown, with thick lighter 

 colored sapwood. 



Distribution. Scattered but nowhere abundant through Pine forests on the slopes 

 of canons and on high ridges usually from 6000- 7000 above the sea on the moun- 

 tains of western Texas, and of New Mexico and Arizona south of the Colorado 

 plateau; in northern Chihuahua and Sonora. 



20. Quercus Wislizeni, A. DC. Live Oak. 



Leaves narrowly lanceolate to broadly oval, mostly oblong-lanceolate, acute or 

 rounded and generally apiculate at the apex, rounded or truncate or gradually nar- 

 rowed and wedge-shaped at the base, entire, serrulate or serrate or sinuate-dentate, 

 with spreading rigid spinescent teeth, when they unfold thin, dark red, ciliate, and 

 covered with pale scattered stellate hairs, at maturity thick and coriaceous, glabrous 

 and lustrous, dark green on the upper ;iml puler and yellow-green on the lower 

 surface, usually I'-l^' long and about $' wide, with obscure primary veins and con- 

 spicuous reticulate veinlets, gradually deciduous during their second summer and 



