98 FAGACEAE. 



Acorns ovoid, acute ; cup covering about l / 2 of the acorn. 



7. Q. Gambellii. 

 Leaves pale green, more persistent. 



Lobes oblong-ovate, obtuse or acutish, not mucronate. 



8. Q. venustula. 

 Lobes triangular-ovate, mucronate. g. Q. Fendleri. 



Leaves persistent, evergreen, sinuate ; lobes or teeth spinulose-tipped or mucronate. 

 Leaves decidedly crisped, sinuately lobed ; lobes distinctly spinulose-tipped. 



10. Q. pungens. 

 Leaves flat, sinuately toothed ; teeth mucronate or slightly spinulose-tipped. 



11. Q. undulata. 



1. Quercus utahensis (A. DC.) Rydb. (Q. stcllata Utahensis A. DC.) A 

 small tree, often 10 feet or more high, growing in the mountain regions of 

 Utah, Colo., Ariz, and N. M. Alt. 4000-9000 ft. Chaparral-covered hills 

 southeast of Ouray ; Hotchkiss, Delta Co. ; Trinidad ; Glenwood Springs ; 

 Mancos ; North Cheyenne Canon ; Wahatoya Canon ; hills about Box Canon, 

 west of Ouray ; Manitou ; Mancos Canon ; west of Palmer Lake ; Glen Eyrie. 



2. Quercus Vreelandii Rydb. A chaparral-forming shrub, 1-1.5 m - high, 

 growing on hillsides in Colo, and N. M. Alt. 4000-9000 ft. Chaparral-covered 

 hills southeast of Ouray; Cerro; Glenwood Springs; butte five miles south- 

 west of La Veta ; South Cheyenne Canon ; Colorado Springs. 



3. Quercus leptophylla Rydb. A tree, 10-15 m. high, growing along streams 

 in the mountains of Colorado. Alt. 5500-8500 ft. Turkey Creek and tribu- 

 taries ; Cucharas River, above La Veta ; North Cheyenne Canon ; Routt Co. ; 

 Chicken Creek, West La Plata 'Mountains. 



4. Quercus Gunnisonii (Torr.) Rydb. A chaparral-forming shrub, 1-3 m. 

 high, growing on hillsides and mesas from Colo, to Utah, N. M. and Ariz. 

 Alt. 6000-8000 ft. North Cheyenne Canon; butte five miles southwest of 

 La Veta ; Colorado Springs ; Cochetopa Pass ; Canon of Arkansas ; Canon 

 City ; Durango ; hills back of Manitou ; Steamboat Springs ; Denver. 



5. Quercus nitescens Rydb. A chaparral-forming shrub, 3-5 m. high, grow- 

 ing on mesas and hillsides, but along streams sometimes forming a small tree; 

 in Colo, and eastern Utah. Alt. 6000-11,000 ft. Butte five miles southwest 

 of La Veta; Glenwood Springs; chaparral-covered hills southeast of Ouray; 

 Red Mountain, south of Ouray; hills about Box Canon, west of Ouray; West 

 Mancos Canon ; Four-Mile Hill, Routt Co. ; Los Pinos ; Ute Pass, near 

 Pike's Peak; Cheyenne Canon, near Pike's Peak. 



6. Quercus novomexicana (A. DC.) Rydb. (Q. Douglasii Novomexicana 

 A. DC.) A chaparral-forming shrub, 3-5 m. high, or along streams a small 

 tree, from Colo, to Utah and N. M. Alt. 4000-9000 ft. Glenwood Springs; 

 Engelmann Canon ; between Pallas and Sydney ; Cucharas River, above La 

 Veta ; Mancos ; Manitou ; chaparral-covered hills southeast of Ouray ; Chey- 

 enne Mountain ; Canon City. 



7. Quercus Gambellii Nutt. A chaparral-forming shrub, 3-5 m. high, grow- 

 ing on hillsides from Colo, to Utah and N. M. Alt. 6500-9000 ft. Chaparral- 

 covered hills southeast of Ouray; Cucharas River, above La Veta; Gunnison; 

 Twelve-Mile Creek ; north of Cheyenne Canon ; Manitou ; Canon of the 

 Arkansas ; South Park ; Ute Pass ; Garden of the Gods. 



8. Quercus venustula Greene. A small shrub, 1-2 m. high, known only 

 from the type locality. Raton Mountains, near Trinidad. 



