76 Bulletin of the University of Texas 
trunk in loose, elongated plates. Leaves obovate or oblanceo- 
late, with 5-7 shallow lobes, wedge-shaped at base, bluish green 
and shining above, paler and hairy beneath, remaining on the 
tree until the new leaves of the following spring unfold. 
Acorns sessile or very short stalked; nut ovoid, cup saucer- 
shaped, scales appressed, encloing about one-fourth of the nut. 
West Texas and Mexico. Most abundant in dry limestone 
soil. 
The wood is used for fuel. 
14. Quercus undulata Torrey. Shin oak. <A_ shrub or 
small tree sometimes 25°-30° high with thin sealy gray bark, 
and reddish brown twigs. Leaves oval to oblong 1’-3’ 
long, %4’- 4%’ wide entire or with wavy sometimes toothed 
margin, smooth and lustrous above, yellowish brown beneath, 
peris: ut. Fruit ripen'ng the first season, solitary or in vairs, 
sessile or stalked. Acorn oval 34’-1’ long enclosed for about 
one-third its length in the cup. 
On dry ridges and cliffs, Colorado, New Mexico, Arizona, 
Utah, Nevada, western Texas, and Mexico. 
15. Quercus oblongifolia Torrey. Blue Oak. A small tree 
usually not over 30° in height, and 18’-20’ in diameter. It 
branches freely to form a rounded symmetrical crown. The 
bark is. 34’-114’ thick, hght gray, scaly, the scales are close, 
regular. Leaves oblong, ovate or oblanceolate, entire or 
notched at the apex of the undulate margin, bluish green per- 
sistent until the new leaves of the following spring. Acorns 
are sessile or stalked; nut ovoid, dark brown, %’-%’ long, 
about one-third enclosed in the hemispheric, hairy cup. 
Chisos Mountains of West Texas, extending into Mexico, 
Arizona, and New Mexico. The trees are small and are only 
used for fuel. 
16. Quercus hypoleuca Englemann. White Leaf Oak. A 
shrub or small tree usually not over 30°-40° high with round 
top, spreading slender branches, and rough fissured dark bark. 
Leaves lanceolate, elliptic -or oblong lanceolate, 2’-4’ long, 
14’-1’ wide, with thickened margins, entire or some of them 
slightly toothed, bristle tipped, yellowish green and lustrous 
above, whitish and wooly beneath. Fruit ripening in the see- 
