(207) 



paler beneath than above. It is generally a much lower 

 shrub. The leaves are light colored, somewhat yellowish, 

 when they unfold. It grows on dry hillsides and mesas at 

 an altitude of 2000-2500 m. 



Colorado: Cochelopa Pass, Gunnison Expedition , 4.J 

 (type in Columbia herbarium) ; La Veta, 1900, F. K. Vree- 

 cand, 6/8; Cucharas Valley, 693; North Cheyenne Canon, 

 1896, E. A. Bessey (/); Colorado Springs, 1872, Torrey ; 

 Canon of the Arkansas, 1874, &. Engelmann, 3; Colorado 

 City, 1871, W.M. Candy; Canon City, 1874, T - & Bran- 

 degee. 



New Mexico : Mogollon Mountains, 188 1, H. II. Rusby, 



Arizona: Grand Canon, 1894, J. W. Tourney; Flagstaff, 

 1889, Mnnson & Hopkins (Ji). 



Utah: Echo, 1895, Rydberg; Cottonwood Canon, 1869, 

 S. Watson, 1086, in part; City Creek Canon, 1888, M. E. 

 Jones, 1J22. 



Illustrations: PI. 26. jig. 3. 



7- Quercus nitescens sp. nov. 



£>uercns Gambelii (?) Greene, West Am. Oaks, 2: 71. 

 1890 ; Sargent, Silva N. Am. 8 : 33, in part. 1895. 



^iiercics alba var. GunnisoniiVoxX.. & Coult. Syn. Fl. Colo. 

 127, in part. 1874. 



A shrub 3-5 m. high. Bark of the stems gray and flak)-, 

 that of the branches light brown ; young branches puberulent : 

 bud-scales light brown, pubescent: petioles 1— 1.5 cm. long, 

 puberulent : blades broadlv obovate in outline, deeply divided 

 at least three-fourths to the midrib or sometimes almost to it, 

 very firm, red and somewhat stellate puberuk-nt when un- 

 folding in the spring; upper surface in age dark green and 

 very shining; lower surface paler and puberulent; lobes 

 spreading, broadly oblong, entire or sinuately lobed, usually 

 rounded at the apex : fruit subsessile : cup hemispherical, 

 10-15 mm. wide, covering about one-third of the acorn ; 

 scales ovate and much corky-thickened on the back ; acorns 

 15-18 mm. long, barrel-shaped, mostly obtuse. 



This is the most common oak of the group, especially in 



