(203) 



£>ttercus Douglasii ,? P Gambelit A. DC. Prod. 16 2 : 23, 

 in part. 1864. 



Jgjiercus alba var. Gunnisonii Wats. King's Rep. 5: 321, 

 in part. 1871. 



A small tree, often 10 m. high or more or sometimes onlv 

 a shrub. Bark of young branches light brown and pubes- 

 cent, less roughened than in the preceding ; bark of the 

 older branches brown or gray, but not as light and shining 

 as in JjK submollis ; bark of the trunk rough and furrowed : 

 bud-scales thin, brown, somewhat hairy and puberulent : 

 petioles about 1 cm. long, puberulent : leaf-blade 6-10 cm. 

 long, broadly obovate, deeply divided, often to near the mid- 

 rib ; lobes oblong, rounded at the apex, the larger usually 

 again lobed or undulate ; upper surface sparingly stellate, in 

 age glabrate, dark green and glossy ; lower surface brownish, 

 pale, densely and softly pubescent, almost velvety, strongly 

 veined: fruit subsessile : cup hemispheric, 12-15 mm. in 

 diameter ; scales pubescent, ovate, with much thickened 

 corky backs ; acorn ovoid, barrel-shaped, mostly obtuse, 

 15-20 mm. long, light brown. 



This species closely resembles the preceding as stated above. 

 The leaves are as a rule deeper divided and resemble there- 

 fore more those of ^ nitescens, from which this species differs 

 mainly in the larger size of the tree and the dense pubescence 

 of the lower surface of the leaves. It grows in mountain 

 regions of Utah, Colorado, Arizona and New Mexico. The 

 following specimens belong here : 



Utah: Salt Lake City, 1880, Geo. Engelmann ; Bear 

 River Valley, 1843, Fremont, 749; Filmore Canon, 1872, 

 H. C. Yarrow; Lake Camp, 1845, Fremont, jii (/),* Span- 

 ish Fork of Uintah, 1844, Fremont, §06 (/?),' Wahsatch 

 Mountains, 1869, S. Watson, 1086, in part; Spring Lake, 

 1875, C. C. Parry. 



Arizona: Grand Canon of the Colorado, 1897, T. F. 

 Allen (/); Pagumpa, 1894, M. E. Jones, 5094. {fl)\ Camp 

 Apache, 1873, G. K. Gilbert {Jl); Santa Rita Mountains, 

 1881, C. G. Privglc, 7 and 10*, also 12 (Jl) ; southern Ari- 



* Pringle's specimens are in flower, the leaves are longer, narrower and 

 less deeply lobed than usual, 10-18 cm. long, and may belong to a distinct 

 species. They have the soft pubescence of this species, however. 



