250 HOTANY. 



territory. A tree 20-30 feet high, at Willow Spring, Arizona, at an 

 altitude of 7,500 feet, Rothrock (252), L874. 



V;ir. pungens, Engelm. /.<■.; Q. pungens, Liebm. — Shrubby, leaves 

 much smaller, often only 1' long, of paler color and rigid coriaceous texture, 

 Bpiny-dentate, often somewhat persistent; acorns smaller, mostly elongated, 

 with tomentose, Bcaly, usually less knobby cups. Collected throughout 

 Arizona by the different Expeditions. 



Var. oblongata ; Q. oblongifolia, Ton*. Bot. Mex. Bound. 206, not Bot. 

 Sitgr. — Shrub or small tree with small (1-1 V long-), oblong, more or less 

 entire, pale, coriaceous leaves, smooth and shining above, scarcely reticulate 

 below; acorns long-peduncled. — On the Mesa south of Black River, Arizona. 

 and in Rocky Canon, Arizona, Rothrock (292), 1874. A form of this, var. 

 grandifolia, Engelm. /. c, with leaves 3-5' long-, and peduncles 2-3' in length, 

 occurs occasionally from Southern Colorado to Arizona. 



Var. grisea, Engelm. he; Q.grisea, Liebm. — With similar-shaped, entire 

 or irregularly dentate, very thick leaves, often cordate at base, below 

 strongly reticulate, and, like the branchlets, yellowish pubescent, with lar- 

 ger, subsessile or short-peduncled acorns. A bush or small tree, 20° high.— 

 Camp Apache, Dr. Girard, G. K. Gilbert, and at Camp Bowie, Rothrock 

 (508), 1874. This form evidently connects with the next species. 



Quercus reticulata, H. B K. — A shrubby White Oak, with coarse, 

 persistent, short-petioled, obovate leaves, cordate at base, broader and 

 obtuse above, repandly spinous-dentate, strongly reticulate, and below, 

 together with the branchlets, fulvous-tomentose, sparsely stellate-hairy 

 above; fruit-peduncles about half as long as the leaves or shorter, bearing 

 one to several acorns in deep, strongly tuberculate cups. — On .Mount Gra- 

 ham, Arizona, at 9,500 feet altitude, Rothrock, 1874 (759). A shrub, 2-4 

 feel high, with leaves 2' long and \\' wide. It agrees perfectly with the 

 Mexican tonus, which, however, seem to make large trees, often with larger 

 leaves; the leaves of the previous year are found to be persistent even as 

 late as September. 



Quercus Emoryi, Torrey, Bot Emory's Exped 1848, 151, t. 9, not of 

 Bot Mex. Bound.; Engelm. I. c. 382 ami 394; Quercus hastata, Liebm. — A 

 Shrubby or arborescent Black Oak, with rough, black bark, an:! .lark-it 



IVell 



