WOOTON AND STANDLEY FLORA OF NEW MEXICO. 173 



New Mexico: Common in all the mountain ranges. Middle elevations in the 

 Transition Zone. 



This is the common white oak throughout the State, perhaps dividing that distinc- 

 tion in the southern part with Q. novomezicana. It is frequently a shrub growing in 

 clumps and, in the mountains of the southern part of the State, equally often a solitary 

 tree. It often has a trunk 30 to 40 cm. in diameter, with a large spheroidal top, reach- 

 ing a height of 10 meters or more. The leaves are bright green above, paler and almost 

 velvety beneath, deciduous in late autumn, turning yellow before falling. In 

 outline they are broadly oblong-obovate, deeply lobed, the lobes rounded at the apex. 

 The acorn is of medium size, 15 to 20 mm. long, obtuse, in a thickened, hemispheric 

 cup. 



20. Quercus vreelandii Rydb. Bull. N. Y. Bot. Gard. 2: 204. 1901. 

 Type locality: Mesa near La Veta, Colorado. 



Range: Mountains of southern Colorado and northern New Mexico. 

 New Mexico: Ghamsi {Baker 280). In the Transition Zone. 



The specimens upon which the species is included are doubtfully referred here by 

 Doctor Rydberg himself. 



21. Quercus leptophyUa Rydb. Bull. N. Y. Bot. Gard. 2: 205. 1901. 

 Type locality: Tributaries of Turkey Creek, Colorado. 



Range: Mountains of southern Colorado and northern New Mexico. 



New Mexico: Johnsons Mesa; Trinchera Pass; Folsom; Chama; White Mountains. 

 Transition Zone. 



A rough, scraggy tree with dark bark, very crooked limbs, small top, large obovate 

 dark green leaves, and a short acorn about half covered by the cup. It grows 

 commonly in clusters on the sides of canyons in the mountains, or on the high mesas 

 of the northern and eastern parts of the State. The acorns are rarely abundantly 

 produced. 



22. Quercus gunnisonii (Torr.) Rydb. Bull. N. Y. Bot. Gard. 2: 206. pi. 26. f. 3. 

 1901. 



Quercus alba gunnisonii Torr. U. S. Rep. Expl. Miss. Pacif. 2': 130. 1855. 



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



Type locality: "Coochetopa Pass, Sierra San Juan," Colorado. 



Range: Mountains of southern Colorado and Utah and northern New Mexico and 

 Arizona. 



New Mexico: Tunitcha Mountains; Cedar Hill; Dulce; Raton Mountains; Folsom; 

 Pecos; East View; Luna Valley; Gallinas Mountains. Upper Sonoran Zone. 



One of the common shrubby oaks of the northern part of the State, resembling 

 Q. gambelii, cuming into our range from Colorado and Utah. The leaves are oblong 

 in outline, sinuately lobed, green, deciduous, not velvety beneath. The acorn is 

 obtuse, barrel-shaped, in a much thickened and rather deep cup. In general appear- 

 ance it approaches most closely Q. utahensis, but is to be distinguished from that 

 species by the absence of a velvety pubescence on the back of the mature leaves. 



23. Quercus novomexicana (A. DC.) Rydb. Bull. N. Y. Bot. Gard. 2: 208. 1901. 

 Quercus douglasii novomexicana A. DC. in DC. Prodr. 16^: 24. 1864. 



Quercus nitescens Rydb. Bull. N. Y. Bot. Gard. 2: 207. 1901. 



Type locality: Santa Fe, New Mexico. Type collected by Fendler (no. 809). 



Range: Mountains of New Mexico, Colorado, and Utah. 



New Mexico: Carrizo Mountains; Santa Fe and Las Vegas mountains; Sandia 

 Mountains; Ramah; East View; Mogollon Mountains; Black Range; Organ Mountains; 

 White and Sacramento mountains. Transition Zone. 



A shrub in the mountains of the northern part of the State, but frequently becoming 

 a good-sized tree in the southern part. The mature leaves are about the largest among 



