(205) 



yellow when unfolding, turning pinkish yellow in age. It 

 grows on hillsides at an altitude of about 2500 m. 



Colorado : Mesas near La Veta, 1900, F. K. Vreeland, 

 6Sj (type) ; Butte, five miles southwest of La Veta, Rydberg 

 & Vrceland, 6jj;o (l,Jl), 6349 (7'J^)- 



New Mexico : 1847, A. Fendler, 8iob y in part. 



Illustrations: PL 23, f. j ; Sargent, Silva, pi. j6?. f. 1. 



A peculiar form with smaller, more glossy and more oblong 

 leaves 5-6 cm. long, and smaller fruit with cup only 8-10 

 mm. wide and covering about one-third of the more acute 

 acorn I refer doubtfully to this species. It is represented by 

 the following specimens : 



New Mexico : Cham a, 1899, C. F. Baker, 280. 



Colorado: Trinidad, 1892, C. S. Crandall (/). 



4. Quercus leptophylla sp. nov. 



Qiiercus Gambelii Sargent, Silva N. Am. 8: 33, in part. 

 1895. 



A tree 10-15 m - high. Bark of young twigs brownish or 

 purplish, slightly pubescent at first ; that of the older branches 

 gray ; that of the trunk rough and furrowed : bud scales very 

 thin, brown, glabrous: petioles about 1.5 cm. long, sparingly 

 stellate : leaf-blades broadly obovate, very thin^pinnately 5-9- 

 lobed scarcely more than half way to the midrib ; lobes 

 rounded ; upper surface at first sparingly stellate, soon gla- 

 brate, bright green, but not very glossy; lower surface paler, 

 almost perfectly glabrous, or pubescent on the veins : fruit sub- 

 sessile : cup hemspheric, about 15 mm. wide, covering about 

 half the acorn; scales ovate- lanceolate, obtuse, only slightly 

 thickened on the back ; acorns short barrel-shaped, obtuse or 

 even depressed at the apex. 



This species has a cup that most resembles that of i£. sub- 

 mollis but the scales are slightly more thickened. These two 

 are the only White Oaks of the region that do not have thick, 

 corky scales. J^. leptophylla is easily distinguished from 

 ££. submollis and the other oaks of the region by the thin, 

 almost glabrous leaves ; in Colorado it is the only species 

 that reaches the size of a large tree, as far as I know. All 

 the scrub-oaks of the State grow on the open mesas or the 



