168 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



What is here accepted as Quercus undulata is a low, straggling shrub 1 to 3 meters 

 high, with small oblong leaves 3 to 5 cm. long, their margins sinuate-dentate, the 

 teeth few and distinctly cuspidate but not spinulose. The leaves are firm but not 

 coriaceous, and Doctor Rydberg believes them to be blue green, although from the 

 type specimen and the description it is impossible to determine this. However, 

 this is the common type of plant having the other characteristics ascribed to the 

 species that is to be found in eastern Colorado and northeastern New Mexico, the 

 region from which the type came. 



The plant here accepted is one of the two common shrubs having blue green leaves 

 in the mountains of the northern part of the State. It also occurs as a low shrub high 

 up on the peaks of the dry, rocky mountains of the southern part, a thousand feet or 

 more above the common live oaks of that region. The acorns are rather small, 10 to 

 15 mm. long, in a thickened, hemispherical cup. 



4. Quercus rydbergiana Cockerell, Torreya 3: 7. 1903. 

 Quercus undulata rydbergiana Cockerell, Torreya 3: 86. 1903. 



Type locality: Las Vegas Hot Springs, New Mexico. Type collected by Cockerell. 



Range: Mountains of the north central part of New Mexico. 



New Mexico: Las Vegas Mountains; Cebolla Springs. Transition Zone. 



A small bush, 1 meter high or less, with small (2 to 4 cm. long), oblong, bluish green 

 leaves with a few coarse sinuate lobelike teeth. The acorns are very small, less than 

 1 cm. long, in a shallow cup whose scales are very small, numerous, and somewhat 

 thickened on the back. 



This certainly is a relative of what 4s here regarded as Q. undulata, and Professor 

 Cockerell may be right in reducing it to a subspecies of that, but it is more easily 

 separable from Q. undulata than is Q. fendleri and is more distinct than the various 

 species or subspecies, as one chooses to consider them, that are grouped around Q. 

 gambelii. There is little doubt that the various Rocky Mountain species hybridize 

 readily, as seems to be the case with the eastern members of the genus. 



5. Quercus pungens Liebm. Overs. Dansk. Vid. Selsk. Forh. 1854: 171. 1854. 

 Quercus undulata tvrightii Engelm. Trans. Acad. St. Louis 3: 382. 1876, in part. 

 Quercus undulata pungens Engelm. Trans. Acad. St. Louis 3: 392. 1876. 



Type locality: "Texas & Nov. Mexico. — California." 



Range: Western Texas, New Mexico, southeastern Arizona, and adjacent Mexico. 



New Mexico: Sandia Mountains; Mangas Springs; Silver City; Black Range; 

 Big Hatchet Mountains; Dona Ana Mountains; mountains west of San Antonio; 

 Carrizalillo Mountains; Organ Mountains; Queen; Socorro Mountain. Dry, rocky 

 mountains, in the Upper Sonoran Zone. 



A scrubby bush, 2 to 3 meters high, with small, coriaceous, spiny-toothed leaves on 

 rather slender branches. Doctor Rydberg may be right in his belief that it is most 

 closely related to Q. undulata, but it seems to be allied with Q . toumeyi and Q. turbinella. 

 It is possible that the specimens referred in this treatment to Q. turbinella more 

 properly belong to this species. 



6. Quercus turbinella Greene, W. Amer. Oaks 1: 37. 1889. 

 Type locality: Mountains of Lower California. 



Range: Lower California to southwestern New Mexico and adjacent Mexico. 



New Mexico: Bear Mountain; Socorro; Magdalena Mountains; Cook Spring. 

 Dry hills, in the Upper Sonoran Zone. 



A shrub (or low tree ?) with small (1 to 3 cm. long), oblong, elliptic, or oval leaves, 

 bluish green above, fulvous beneath, sinuate-dentate wth spiny teeth. The acorn 

 is elongated, acute, with a turbinate cup whose scales are only slightly thickened. 



It is possible, not to say probable, that further study in the field will show that true 

 Q. turbinella, which was named from the Calif omian peninsula, does not come into 

 New Mexico at all. 



