274 



TREES OF NORTH AMERICA 



A tree, 30-40, or occasionally 60 high, with a trunk l-2 in diameter, spreading 

 branches forming a shapely round-topped head, and slender branchlets coated at first with 

 hoary tomentum, becoming light brown tinged with red or orange color. Winter-buds 

 ovoid, acute or obtuse, nearly j' long, with many loosely imbricated light chestnut-brown 



Fig. 250 



scales more or less clothed with pale pubescence. Bark thin, reddish brown, broken into 

 large closely appressed scales. Wood heavy, hard, close-grained, compact, pale yellow- 

 brown, with lighter colored sap wood. 



Distribution. Deep narrow canons and high wind-swept slopes of Santa Rosa, Santa 

 Cruz, and Santa Catalina islands, California; on Guadalupe Island off the coast of Lower 

 California. 



27. Quercus Emoryi Torr. Black Oak. 



Leaves oblong-lanceolate, acute and mucronate at apex, cordate or rounded at the 

 slightly narrowed base, entire or remotely repand-serrate with 1-5 pairs of acute rigid 

 oblique teeth, when they unfold thin, light green more or less tinged with red and covered 

 with silvery white tomentum, at maturity thick, rigid, coriaceous, dark green, very lus- 

 trous and glabrous or coated above with minute fascicled hairs, pale and glabrous or puberu- 

 lous below, usually with 2 large tufts of white hairs at the base of the slender midrib, 

 obscurely reticulate-venulose, l'-2|' long, '-!' wide; falling gradually in April with the 

 appearance of the new leaves; petioles stout, pubescent, about j' in length. Flowers: 

 staminate in hoary tomentose aments; calyx light yellow, hairy on the outer surface, di- 

 vided into 5-7 ovate acute lobes; pistillate sessile or short-stalked, their involucral scales 

 covered with hoary tomentum. Fruit ripening irregularly from June to September, sessile 

 or short-stalked; nut oblong, oval, or ovate, narrowed at base, rounded at the narrow 

 pilose apex, '-f long, about f thick, dull light green when fully grown, dark chestnut- 

 brown or nearly black at maturity, with a thin shell lined with thick white tomentum, 

 inclosed for from one third to one half its length in the deeply cup-shaped or nearly hemi- 

 spheric cup light green and pubescent within, and covered by closely imbricated broadly 

 ovate acute thin and scarious light brown scales clothed with short soft pale pubescence. 



A tree, usually 30-40 high, with a short trunk 2-3 in diameter, stout rigid rather 

 drooping branches forming a round-topped symmetrical head, and slender rigid branch- 

 lets covered at first with close hoary tomentum, bright red, pubescent or tomentose in 

 their first winter, ultimately glabrous and dark red-brown or black; sometimes 60-70 

 high, with a trunk 4-5 in diameter, with a head occasionally 100 across; or at high alti- 



