(217 ) 



lobes more decidedly spinulose-tipped and the acorns shorter ; 

 intergrading forms are occasionally met with. The species 

 grows on dry mesas and hills, perhaps to an altitude of 2000 

 m. This is an evergreen even at its northern limit. Bran- 

 degee found it in Colorado bearing old green leaves in Jan- 

 uary and April. 



Texas: Western Texas, 1849, C - Wright, 664 (type); 

 Between San Pedro and Howard Springs, 185 1, Bigelozu, 

 (Mex. Bound. Surv.) ; Guadalupe Mountains, 1881, Dr. V. 

 Havard, 66 and 67; El Paso, 1881, G. R. Vasey. 



Colorado : Canon City, 1873 and 1875, T. S. Brandegee; 

 Arkansas Canon, 1874, Engelmann. 



Utah : Barton's Range and Butler's Wash, San Juan Co., 

 1895, Alice Eastwood, 140. 



Arizona: Swisshelm Mountains, 1894, /. W. Totem ey ; 

 Santa Catalina Mountains, 1881, J. G. Lemmon; Skull 

 Valley, 1865, Cones & Palmer, 234; Rencou Mountains, 

 1894,/. W. Tourney; 1851, Woodhouse (Sitgreaves Exped.). 



Mexico : Santa Eulalia Mountains, 1886, C. G. Pr ingle, 

 84.9; 1885, 172. 



Illustrations: PI. jo. f. 3; Oersted, Liebm. Chenes . 

 Am. Trop. fl. 45. f. 1-3; Greene, W. Am. Oaks, fl. 13. 

 f. 4; Sargent, Silva N. Am. pi. 385*. f. 5. 



18. Quercus undulata Torr. Ann. Lye. N. Y. 2 : 248. 



1828. 



^tcercus undulata y Jamesii Engelmann, Trans. St. Louis 

 Acad. 3: 382. 1876. 



A shrub 1-3 m. high. Bark of the trunk gray, rough and 

 much cracked, that of the branches light gray and with 

 numerous lenticels ; that of the young twigs sparingly stellate- 

 pubescent : petioles 2-6 mm. long : leaf-blades firm, but less 

 so than in J^. fungens, pale bluish or brownish green and 

 shining above, pale brownish beneath, stellate when young, 

 almost glabrous in age on both sides or even densely stellate 

 pubescent beneath, only sinuately dentate, acute at both ends ; 

 teeth mucronate, scarcely spinulose : cup hemispheric, 7-10 

 mm. broad; scales ovate, strongly corky-thickened on the 



