(206) 



hillsides; this is only found along streams, especially in 

 the canons. I have seen specimens with trunks over 2 m. in 

 circumference and 15 m. high. In general habit and its 

 vigorous growth it is so unlike the other oaks of the region, 

 that I can not see why it has been included in £>. Gambclii. 

 It grows at an altitude of 1800-2700 m. 



Colorado : Tributaries of Turkey Creek, Rydberg & 



Vreeland, 6347 (type) ; North Cheyenne Canon, 1896, E. 



A. Bessey; Routt Co., 1894, and Manitou, 1892, C. S. 



Crandall (fi); Table Rock, 1891, Crandall, 463 (/); 



Chicken Creek, 1898, Baker, Earle & Tracy, 803 (/). 



Illustrations: PL 26, fig. 1-2. 



6. Quercus Gunnisonii (Torr.). 

 £>iiercus alba ,3 (?) Gunnisonii Torr. Pac. R. R. Rep. 2 1 : 

 130. 1855. 



Jthiercus nndiclata ft Gunnisonii Engelm. Trans. St. Louis 

 Acad. 3: 382. 1876. 



Quercus Gambelii var. Gunnisonii Wenzig, Jahrb. Bot. 

 Gar. Berlin 3: 190. 1885. 



A low shrub * 1-3 m. high. Bark of young branches light 

 brown, puberulent, of the older branches and the trunk gray, 

 somewhat shreddy: bud-scales brown, pubescent: petioles 

 about 1 cm. long, puberulent: leaf-blades oblong, elliptic or 

 narrowly obovate in outline, lobed to about half way to the 

 midrib, with rounded lobes generally directed forward, verv 

 thick, somewhat pale and bluish green above, sparingfy 

 stellate or soon glabrate, not very shiny; lower surface 

 scarcely paler but brownish, puberulent, strongly veined: 

 fruit subsessile : cup rather deep, 12-15 mm - * n diameter, 

 hemispherical, covering about one-third of the acorn ; scales 

 ovate with a lanceolate tip, at least the lower much thick- 

 ened and corky on the back ; acorns barrel-shaped, obtuse 

 or even depressed at the apex. 



This species differs from £>. Gambclii in the obtuse acorn, 

 and in the narrower and firmer leaves, which are not much 



Tii, i as well as several other species are here described as shrubs. The 

 individuals have, however, often single trunks. A great number grow 

 generally together and form a large thicket of individuals of the same 

 height ; a thicket of one species is easily distinguished from that of another 

 even at a distance by the different color of the leaves. 



