FLOWERING PLANTS AND FERNS OF ARIZONA 227 



10. Quercus gambelii Nutt., Acad. Nat. Sci. Phila. Jour. ser. 2, 1: 



179. 1848. 



Q. gunnisonii Rydb., N. Y. Bot, Gard. Bui. 2: 206. 1901. 

 Q. novomexicana Rydb., ibid. p. 208. 

 Q. submollis Rydb., ibid. p. 202. 

 Q. utahensis Rydb., ibid. p. 202. 



Throughout the State, except the extreme western and south- 

 western parts, commonly 5,000 to 8,000 feet, often forming thickets. 

 Colorado to Nevada, south to northern Mexico. 



Rocky Mountain white oak, Gambel oak. In Arizona Q. gambelii 

 ranges from a shrub 2 m. (6.5 feet) or less in height to a tree 15 m. (50 

 feet) high, in protected sites. The deeply lobed, deciduous leaves of 

 this species make it readily recognizable among Arizona oaks. In a 

 species so variable in size, lobing, and pubescence of the leaves, the 

 fine distinctions of Rydberg are untenable. 



11. Quercus palmeri Engelm., Acad. Sci. St. Louis Trans. 3: 393. 



1877. 



Quercus chrysolepis Liebm. var. palmeri Engelm in S. Wats., 



Bot, Calif. 2: 97. 1880. 

 Quercus wilcoxii Rydb., N. Y. Bot. Gard. Bui. 2: 227. 1901. 



Hualpai Mountain (Mohave County) to the mountains of Greenlee, 

 Cochise, and Pima Counties, 3,500 to 7,000 feet, often forming thick- 

 ets. Arizona, California, and northwestern Mexico. 



Palmer oak. A shrub or small tree, commonly 2 to 4 m. (6 to 13 

 feet) high. It cannot be confused with other species of oaks in 

 Arizona, but its specific distinction from Q. chrysolepis Liebm. of 

 California is open to question. The superficial resemblance of its 

 pungently toothed, glaucous leaves, resinous beneath, to descriptions 

 of Q. turbinella might be confusing until one becomes familiar with 

 both species. The scales of the fruiting cups are dependable criteria. 



12. Quercus emoryi Torr. in Emory, Mil. Reconn. 151. 1848. 



Quercus hastata Liebm., Overs. Danske Vidensk. Selsk. Forh. 

 1854: 171. 1854. 



Yavapai to Cochise, Santa Cruz, and Pima Counties, 4,000 to 8,000 

 feet, dry foothills and moist canyons. Western Texas to Arizona 

 and northern Mexico. 



Emory oak, known locally as blackjack oak and bellota, is one of 

 the most abundant oaks in the^'encmal" areas of the Mexican border 

 region. It forms a shrub, a small tree, or a large tree up to 15 m. (50 

 feet) high and 0.8 m. (2.5 feet) in trunk diameter (pi. 14). 



13. Quercus hypoleucoides A. Camus, Mus. Hist. Nat. Bui., ser. 2, 4: 



124. 1932. 



Quercus hypoleuca Engelm, Acad. Sci. St. Louis Trans. 3: 384. 

 1876. NotMiquel. 



Mountains of Greenlee, Graham, Cochise, Santa Cruz, and Pima 

 Counties, 5,000 to 7,000 feet, on slopes and in canyons. Western 

 Texas to southern Arizona and northern Mexico. 



Whiteleaf oak. This is a widely distributed and fairly common 

 but nowhere very abundant shrub or small tree. 



