42 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



The one-seed juniper is uncommon to the westward of the Perrilla 

 Mountains. A few were seen on the east slope of the Mule Moun- 

 tains at the western border of the Sulphur Spring Valley. We did 

 not see this tree on the San Jose or Huachuca mountains, though a 

 few are known to exist at the base of latter, the species being included 

 in the list of plants collected in the Huachuca Mountains by Maj. 

 Timothy E. Wilcox. 



This is usually a rather scragged tree, from 5 to 10 meters (16 to 35 

 feet) high ; but in the damp canyons at the head of the Yaqui River 

 it grows larger, and has slender branches and a drooping habit of 

 growth. 



JUNIPERUS CALIFORNICA Carriere. 

 CALIFORNIA JUNIPER. 



This is a rather scrubby tree, bearing remarkably large fruit. 

 (See Plate IV, fig. 1.) It was only found on the Coast Range of 

 California, where it descends to the level of Mountain Spring on 

 the east slope (altitude 775 meters, or 2,543 feet). 



JUNIPERUS PACHYPHLCEA Torrey. 

 ALLIGATOR JTJNIPER. 



This is the common species of juniper of the mountains of the 

 interior, along the Mexican Boundary Line. It was. found on the Big 

 Hatchet, Dog, San Luis, and Animas mountains, all in Grant County, 

 New Mexico. It is also common on the opposite side of the Inter- 

 national Line, in the San Luis and Guadalupe mountains of north- 

 western Chihuahua and northeastern Sonora. Farther west it was 

 likewise abundant in the Mule, San Jose, Huachuca, Patagonia, and 

 Pajaritos mountains. 



The extreme vertical range of the alligator juniper, as determined 

 on the Mexican border region, is from 1,355 to 2,545 meters (4,446 

 to 8,350 feet). It was found at the highest summits of the Big 

 Hatchet, Dog, San Luis, Animas, and Patagonia mountains. 



On the Dog Mountains in New Mexico the regular juniper zone 

 on the mountain slopes extends from 1,829 meters (6,000 feet) up to 

 the summits; but in moist canyons it descends to the very base of 

 these mountains. On the Boundary Line, south of the Dog Moun- 

 tains, near Monument No. 55, are several fine alligator junipers at 

 the altitude of 1,475 meters (4,839 feet). 



On the west side of the San Luis Mountains, in Turkey Canyon, 

 the lowest tree of this species stands in a grove of Emery oaks, 

 close to the lower limit of timber, at 1,684 meters (5,525 feet). No 

 others were seen in this canyon until at 1,737 meters (5,700 feet), 

 a well-marked juniper zone was reached. As stated, its range ex- 

 tends to the summit (2,400 meters, or 7,874 feet). The largest tree 



