WOOTON AND STANDLEY FLOEA OF NEW MEXICO. 31 



Branches rough with the persistent leaf basea; leaves 

 quadrangular, falling off when dried; cone 

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

 Br8,nches 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 

 ecars 4. Pseudotsuga (p. ,35). 



1. PINTJS 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. strohiformis . 



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. arizonica. 



1. Pinus edulis Engelm. in Wisliz. Mem. North. Mex. 88. 1848. Pinyon. 



Caryopitys 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, 

 and in the mountains of the northeastern corner of the State. Upper Sonoran Zone, 



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

 bark, dark green leaves, and small, ovoid cones with the scales widely spreading 

 when mature, The tree occurs ii th^ drier foothills, a.ssociate<i with junipers and 



