"WOOTON AND STANDLEY FLOEA OF NEW MEXICO. 167 



Acorns barrel-shaped, obtuse; cup 



various. 



Mature leaves thin, large, obovate, 



cuneate, dark green above; acorn 



very short, frequently more than 



half in the cup 21. Q. leptophylla. 



Mature leaves firm, deeply lobed; 



acorns longer, about one-third in 



the cup. 



Leaves oblong, lobed half way to 



the midrib, dull-colored; lobes 



usually simple 22. Q. gunnisonii. 



Leaves obovate, lobed more than 

 half way to the midrib, dark 

 green above; lobes frequently 

 again lobed 23. Q. novomexicana. 



1. Quercus hypoleuca Engelm. Trans. Acad. St. Louis 3: 384. 1876. 



White-leap oak. 



Type locality: Arizona. 



Range: Southwestern New Mexico, southeastern Arizona, and adjacent Mexico. 



New Mexico: Common from the Black Range and the Mogollon Mountains south 

 to the Mexican border. Low dry mountains, in the Upper Sonoran Zone. 



One of the two easily recognizable species of the State, occurring only in the moun- 

 tains of the southwestern part. It becomes a tree 10 meters high or occasionally higher, 

 but is frequently found as a small bush forming clumps. The leaves are characteristic, 

 being very thick and leathery, oblong-lanceolate, entire or with a few coarse teeth 

 near the apex, yellowish green and glabrous above, densely wliite-woolly beneath. 

 The tree is well worth cultivation for decorative purposes. 



2. Quercus fendleri Liebm. Overs. Dansk. Vid. Selsk. Forh. 1854: 170. 1854. 



Fendler oak. 



Quercus undulata A. DC. in DC. Prodr. 16^: 23. 1864, in part. 



Querctis undulata pedunculata A. DC. in DC. Prodr. 16^: 23. 1864. 



Quercus undulata Sarg. Silv. N. Amer. 8: 75. 1895, in part. 



Type locality: New Mexico, probably near Santa Fe. Type collected by Fendler 

 (no. 805). 



Range: Southern Colorado, northern New Mexico, and Arizona, and in the Pan- 

 handle region of Texas. 



New Mexico: Santa Fe and Las Vegas mountains; Raton; El Rito Creek; Ramah; 

 Sandia Mountains; East View; Gallinas Mountains; White and Sacramento mountains; 

 Buchanan; Duran. Drier mountains, in the Transition Zone. 



This is very near Quercus undulata, with which it is usually geographically asso- 

 ciated, being separated from that species merely by size of the parts and the persistence 

 of the leaves. It is practically impossible to distinguish ordinary herbarium speci- 

 mens showing leaves and fruit. Doctor Rydberg's key puts them in two different 

 subsections on the ground of persistence of leaves, thus throwing Q. undulata next 

 Q. pungens, which has a very different zonal distribution in New Mexico. 



3. Quercus undulata Torr. Ann. Lye. N. Y. 2: 248. 1828. 



Quercus undulata jamesii Engelm. Trans. Acad. St. Louis 3: 382. 1876. 



Type locality: "Sources of the Canadian and the Rocky Mountains," Colorado 

 or New Mexico. 



Range: Northern New Mexico and Arizona and southern Colorado, and western 

 Texas. 



New Mexico: Glorieta; 25 miles south of Gallup ; Pajari to Park; East View; Gallinas 

 Mountains; Buchanan; Duran; Guadalupe Mountains; Sierra Grande; Organ Moun- 

 tains. Drier mountains, in the Transition Zone, extending down into the Upper 

 Sonoran. 



