36 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Type locality: "On the mountaiae back of Clifton, in the extreme eastern part of 

 Arizona." * 



Range: Mountains of southern Arizona and northern Mexico, coming into the 

 southwestern corner of New Mexico. 



New Mexico: San Luis Mountains {Meams 437, 560, 2244). 



2. JUNIPERTJS L. Juniper. Cedar. 



Large or small shrubs with awl-shaped or scalelike leaves; cones indehiscent, fleshy 

 or fibrous; seeds 1 to 4, ovoid. 



KEY TO THE SPECIES. 



Leaves on mature branches not scaleUke, 6 to 12 mm. long, smooth 

 and shining above, glaucous beneath; a low shrub less that 



a meter high, often spreading 1. /. sibirica. 



Leaves on mature branches scalelike, less than 5 mm. long, of the 

 same color on both surfaces; large shrubs or small trees 

 several meters high, never spreading. 

 Seeds 3 or 4; branchlets smooth; leaves with a conspicuous 

 resinous exudate; bark of the trunk broken into irregu- 

 lar quadrangular plates 2. /. pachyphloea. 



Seeds 1 or 2; branchlets mostly scaly; leaves not with a 

 resinous exudate; bark shreddy or stringy. 



Fruit large, about 15 mm. in diameter 3. /. megalocarpa. 



Fruit small, 10 mm. in diameter or less. 



Branchlets slender, drooping; fruit 2-seeded ; leaves 



3-ranked 4. /. scopulorum. 



Branchlets rigid, erect; fruit mostly 1-seeded ; leaves 

 2-ranked. 

 Fruit large, 7 to 10 mm. long, oblong, brown and 

 fibrous at maturity; leaves short and 



obtuse 5. /. utahensis. 



Friut small, 5 to 7 mm. long, little if at all longer 

 than thick, bluish, fleshy; leaves acute, 

 long 6. J. monosperma. 



1. Juniperus sibirica Burgsd. Anleit. Holz. no. 272. 1787. Juniper. 

 Juniperus communis sibirica Rydb. Contr. U. S. Nat. Herb. 3: 533. 1896. 



Type locality: Siberia. 



Range: New Mexico to Alaska and Labrador. 



New Mexico: Chama; Santa Fe and Las Vegas mountains; Taos Mountains; San- 

 dia IMountains. Deep woods, in the Canadian and Hudsonian zones. 



2. Juxdperus pachyphloea Torr. U. S. Rep. Expl. Miss. Pacif. 4: 142. 1857. 



Alligator juniper. 



Type locality: Zuni Mountains, New Mexico. 



Range: Arizona and western Texas to northern Mexico. 



New Mexico: Common from the Zuni Mountains, Black Range, Capitan Moun- 

 tains, and Guadalupe Mountains southward and westward across the State. Low 

 hills, in the Upper Sonoran Zone. 



A round-topped tree 10 meters high or less, with a short, thick trunk, covered with 

 thick, checkered bark which gives it its name of "alligator-bark juniper." On the 

 cliffs at higher elevations it often attains a great age, developing a short and very 

 thick trunk. The fruit is rather large for the genus, 8 to 10 mm. in diameter, ripen- 

 ing the second year. This is the common juniper in the southern part of the State in 

 the foothills. The wood is used for fuel and to some extent for fence posts, although 

 that of other species is preferred. 



