WOOTOJST AND STANDLEY FLORA OF NEW MEXICO. 31 



Branches rough with the persistent leaf bases; leaves 

 quadrangular, falling off when dried; cone 

 scales thin and persistent; cones pendulous... 2. Picea (p. 33). 

 Branches smooth; leaves flat, persistent in dried speci- 

 mens; cone scales and cones various. 

 Cones erect, the scales deciduous; bracts of the 

 cones not exserted; leaves sessile, leaving 



circular scars 3. Abies (p. 34). 



Cones pendulous, the scales persistent; bracts of 

 the cone scales conspicuously exserted, 

 3-parted; leaves petioled, leaving oval 

 scars 4. Pseudotsuga (p. 35). 



1. PINUS L. Pine. 



Large or small trees with needle-shaped leaves in fascicles of 2 or more, surrounded 

 by a persistent or deciduous sheath at the base. 



KEY TO THE SPECIES. 



Leaves in fascicles of 2, short and curved, 3 to 4 cm. long; cones 



small, 4 to 5 cm. long; seeds not winged 1. P. edulis. 



Leaves in fascicles of 3 to 5; leaves, cones, and scales various. 

 Leaves in fascicles of 3 (rarely 4). 



Leaves 4 cm. long or less 2. P. cembroides. 



Leaves 6 cm. long or more. 



Sheaths persistent and conspicuous; leaves 10 to 25 



cm. long; cones 7 to 15 cm. long 3. P. brachyptera. 



Sheaths deciduous; leaves 6 to 9 cm. long; cones 3 to 



5 cm. long 4. P. chihuahuana. 



Leaves in fascicles of 5. 



Cones 10 to 18 cm. long, the scales with unarmed append- 

 ages; seeds with only rudimentary wings; leaves 

 slender, 4 to 8 cm. long. 



Leaves entire 5. P. flexilis. 



Leaves serrulate / 6. P. strobiformis. 



Cones 5 to 7 cm. long, the scales with armed appendages; 

 seeds with conspicuous wings; leaves various. 

 Leaves short and stout, 2 to 4 cm. long, curved, 

 crowded; cone scales with long weak spines; 



cones 6 to 7 cm. long 7. P. aristata. 



Leaves longer, 6 to 10 cm., straight, not crowded; 

 cone scales with short and rigid spines; cones 

 5 to 6 cm. long 8. P. arizoniea. 



1. Pinus edulis Engelm. in Wisliz. Mem. North. Mex. 88. 1848. Pin-yon. 



Cwryopitys edulis Small, Fl. Southeast. U. S. 29. 1903. 



Pinus cembroides edulis Voss, Mitt. Deutsch. Dendr. Ges. 16: 95. 1907. 



Type locality: "Not rare from the Cimarron to Santa Fe, and probably throughout 

 New Mexico." Type collected by Wislizenus in 1847. 



Range: Colorado and Utah to western Texas and northern Mexico. 



New Mexico: Common on low hills and high plains everywhere west of the Pecos, 

 ami in the mountains of the northeastern corner of the State. Upper Bonoran Zone. 



A small, rather scraggy tree, 10 to 12 meters high or less, with rough, dark-colored 

 hark, dark green leaves, and small, ovoid roues with the scales widely spreading 

 when mature. The tree occurs in the drier foothills, aBSQC^ted with junipers and 



