( 222) 



type number of «^. grisea. On account of the slight and 

 not constant differences between j^. Arizonica and ££. grisea, 

 I have been inclined to reduce the former to a subspecies with 

 more reticulate leaves ; but perhaps it is better to regard them 

 as distinct although intermediate forms are apparently not 

 lacking, £>. Arizonica is the most common of the life-oaks 

 of Arizona, growing at an elevation of 1500 to 3000 m. 



Arizona : San Francisco Mountains, 1853, Bigclozv (Whip- 

 ple Exploration, mixed with Q. pun gens); Huachuca Moun- 

 tains, 1894 and 1895, Tourney; Santa Catalina Mountains, 

 1894, Tourney; Svvisshelm Mountains, 1893, Tourney ; Ft. 

 Huachuca, 1892 and 1893, Dr. Wilcox, also 1894, 4.57, 369, 

 341, 44.8, 493, 493b, 496, 304, 449; 1872, Wheeler's Expe- 

 dition; Dr. E. Palmer ; Lowell, 1884, W.F. Parish; Santa 

 Rita Mountains, 1881, C. G. Pringle; Santa Catalina 

 Mountains, 1881, Pringle, 14; also in 1884; Santa Rita 

 Mountains, 1880, Englemann & Sargent. 



New Mexico: Organ Mountains, 1881, G. R. Vasey ; 

 Camp Bowie, 1874, Rothrock, 308; Bear Mountains, 1880, 

 Rusby. 



Mexico: Chihuahua, Guadalupe Canon, 1852, Thurber, 

 766. 



Illustrations: PL 31. f. 3-4; Greene, W. Am. Oaks, 

 pi. 13./. 3; pi. 14; Sargent, Silva N. Am. pi. 389. 



22. Quercus reticulata Humb. & Bonpl. PI. Aequin. 2 : 



40. 1809. 



In Mexico a large tree, but within United States a small 

 tree or shrub only a few meters high. Bark of the trunk 

 brown, more or less seal}', that of the branches brown or vel- 

 lowish, more or less fulvous stellate-pubescent : leaf-buds 

 brown or reddish, ciliate : petioles very short, 3-5 mm. long, 

 stellate-pubescent: leaf-blades obovate, 4-12 cm. long, cor- 

 date or rounded at the base, rounded obtuse or short-acumi- 

 nate at the apex, sinuately dentate above the middle, or en- 

 tire ; teeth mucronate, or with short spinulose tips ; upper 

 surface pale bluish green, in age shining, when young more 

 or less densely stellate : lower surface strongly reticulate, 

 fulvous with dense stellate pubescence : fruit generally pe- 



