WOOTON 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....--..-.-2-0.eee eee eee eens 3. ABres (p. 34). 
Cones pendulous, the scales persistent; bracts of 
the cone scales conspicuously exserted, 
3-parted; leaves petioled, leaving oval 
SCATS.. 2.2.2.2 eee eee eee ee 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.................20.-2-020-022002- 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.........2--22-- 222-2222 ee eee eee 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......-----22-2222-2-0-2--------------- 5. P. flevilis. 
Leaves serrulate.............0000.0-020020- ee eee eee 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..................-2.2.-- 7. P. aristata. 
Leaves longer, 6 to 10 cm., straight, not crowded; 
cone scales with short and rigid spines; cones 
5 to 6 em. long....... 2... eee ee eee eee 8. P. arizonica. 
1. Pinus edulis Engelm. in Wisliz. Mem. North. Mex. 88. 1848. PINYON. 
Caryopitys edulis Small, Fl. Southeast. U. 8. 29. 1903. 
Pinus cembroides edulis Voss, Mitt. Deutsch. Dendr. Ges. 16: 95. 1907. 
Type Locauity: ‘‘Not rare from the Cimarron to Santa Fe, and probably throughout 
New Mexico.”’ Type collected by Wislizenus in 1847. 
Rance: 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 in the drier foothills, associated with junipers and 
