FLOWERIXC PLANTS AND FERXS OF ARIZONA 63 



Western yellow pine, ponderosa pine. In Arizona this species 

 attains a height of 38 m. (125 feet) and a trunk diameter of 0.9 m. 

 (3 feet) or more. The massive straight trunk, free from branches to a 

 great height in mature trees, and the long narrowly pyramidal or 

 nearly cylindric crown with upturned branches, are characteristic. 

 The bark is gray brown to black in yoimg trees, warm russet brown 

 and split into broad plates covered with small concave scales, in older 

 trees. The leaves vary from 2 to 5 in the fascicle, but 3 is the pre- 

 vailing number (pi. 10). 



9. Pinus arizonica Engelm. in Wheeler, U. S. Survey West 100th 



Merid. Rpt. 6: 260. 1878. 



Pinus ponderosa Lawson var. arizonica Shaw, Pubs. Arnold 

 Arboretum 1 : 24. 1909. 



Chiricahua and Huachuca Mountains (Cochise County), Santa 

 Rita and Santa Catahna Mountains (Pima County), 6,000 to 9,000 

 feet, type from the Santa Rita Mountains. Southwestern New 

 Mexico, Arizona, and northern Mexico. 



Arizona pine. This tree attains a height of 30 m. (100 feet) and a 

 trunk diameter of 1.2 m. (4 feet). It is very similar to the western 

 yellow pine (P. ponderosa) , differing chiefly in its usually more slender 

 leaves and in having these commonly 5 in the fascicle. Specimens 

 from the mountains of Cochise and Pima Counties that have been 

 identified as P. ponderosa, having fewer than 5 leaves in the fascicle, 

 are perhaps properly referable to P. arizonica. In the Huachuca 

 Mountains trees with 3 and with 5 needles, respectively, have been 

 observed growing together (see pi. 9). 



10. Pinus latifolia Sarg., Gard. and Forest 2: 496. 1889. 



Pinus apacheca Lemmon, Erythea 2: 103. 1894. 

 Pinus mayriana Sudworth, U. S. Dept. Agr., Forestry Div. 

 Bui. 14:21. 1897. 



Chiricahua, Huachuca, and Dragoon Mountains (Cochise County), 

 Santa Rita Mountains (Pima County), infrequent, 5,000 to 8,200 feet, 

 type of P. apacheca from the Chiricahua Mountains (Lemmon in 1881), 

 type of P. latifolia from the Santa Rita Mountains (Mayr hi 1887). 

 New Mexico and Arizona (probably also northern Mexico). 



Apache pine, Arizona longleaf pine. The great length of the leaves 

 gives young trees a rather striking resemblance to the longleaf pine 

 of the Southeastern States (Pinus palustris), but mature trees have 

 much the habit of western yellow pine (P. ponderosa) . This species is 

 reported to attain a height of 23 m. (75 feet) and a trunk diameter of 

 75 cm. (30 inches). The bark of the trunks is described as darker 

 colored than in P. ponderosa. The lumber is reported to be of fine 

 quality, but the tree is not sufficiently abundant to have commercial 

 importance. 



2. PICEA. 7 Spruce 



Trees; leaves evergreen, narrow, 4-sided, short stalked, blue green or 

 whitish, often silvery in young trees, deciduous in drying; branchlets 

 rough with the persistent, peglike bases of the leaves; cones pendulous. 



7 Reference: Sudworth, George B. the spruce and balsam fir trees of the rocky MOUNTAIN 

 region. U. S. Dept. Agr. Bui. 327. 1916. 



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