STANDLEY TKEES AND SHKUBS OF MEXICO. 57 



Diirango to Nuevo Leon and Chiapas, growing on the mountains up to timber 

 line; type from mountains of Campanario, at 2,700 meters. 



Tree, 13 to 45 meters high; leaves 7 to 15 cm. long, glaucous; young cones 

 blue or sooty black, the mature ones 6 to 12 cm. long, brown or nearly black, 

 dull or lustrous. " Ocote " (Chiapas). 



19. Pinus ponderosa Dougl. : P. Laws. Agr. Man. 354. 1836. 

 Pinus macrophyUa Engelm. in Wisliz. Mem. North. Mex. 103. 1848. 

 Pinus jeffreyi Murray, Bot. Exped. Oreg. 2. pi. 1. 1853. 



Pinus engelmanni Carr. Rev. Hort. 227. 1854. 



In the mountains at middle elevations, Chihuahua to Durango and Baja 

 California. Widely distributed in the western United States and Canada ; 

 type from Washington. 



Large tree, sometimes 70 meters high, with a trunk diameter of 2.4 meters, 

 but usually smaller, the trunk tall and naked, the bark pale reddish brown, 

 broken into large plates ; leaves 7.5 to 40 cm. long, yellowish green ; cones 6 to 

 19 cm. long, early deciduous, reddish brown, lustrous; wood hard and strong 

 but brittle, close-grained, pale and reddish brown or yellow, very resinous, its 

 specific gravity 0.48 to 0..52. "Pino real" (Durango); " plnabete " (New 

 Mexico). 



The western yellow pine is an important source of lumber in northern Mexico 

 and the southern Rocky Mountains. The wood is used for railroad ties, fenc- 

 ing, and all kinds of consti'uction purposes. 



20. Pinus arizonica Engelm. ; Rothr. in Wheeler, Rep. U. S. Surv. 100th 

 Merid. 6: 260. 1878. 



Mountains of Chihuahua and Nuevo Leon. Southern Arizona (type from the 

 Santa Rita Mountains) and New Mexico. 



Tree, sometimes 30 meters high, with a trunk 1.2 meters in diameter ; branches 

 stout, spreading ; bark reddish brown, broken into large irregular plates ; leaves 

 dark green ; wood soft, weak, rather brittle, close-grained, light red or yellowish, 

 very resinous, its specific gravity about 0.50. 



An important source of lumber in the mountains of northern Mexico. 



21. Pinus pring'lei Shaw; Sarg. Trees & Shrubs 1: 211. 1905. 



Michoacan, Guerrero, and Morelos, at subtropical levels ; type from Uruapan, 

 Michoacan. 



Large tree with long sinuous branches ; leaves 15 to 25 cm. long, bright 

 green ; cones 5 to 10 cm. long, pendent or spreading, ocher-yellow, lustrous. 



22. Pinus coulteri' Lambert; Don, Trans. Linn. Soc. Bot. 17: 440. 1837. 



On mountain tops, Baja California. California ; type from Santa Lucia 

 Mountains. 



Tree, sometimes 21 meters high, with a trunk 1.2 meters in diameter; bark 

 dark brown or nearly black, deeply fissured; leaves 15 to 35 cm. long, dark 

 bluish green ; cones 25 to 35 cm. long. 10 to 13 cm. thick, pendent, light yello^^'ish 

 brown ; wood soft, weak, brittle, coarse-grained, light red, resinous, its specific 

 gravity about 0.41. 



'Thomas Coulter (1793-1843) came to Mexico in 1825 as physician for a 

 mining company in Hidalgo. He remained there for a number of years and 

 made collections of plants. From 1831 to 1833 he explored Alta California 

 (now chiefly included in the State of California) and later Sonora, being the 

 first collector who forwarded to Europe collections from the latter region. 

 His collections were sent to Trinity College, Dublin, from which institution 

 they were distributed to various herbaria. A few of his plants are in the 

 U. S. National Herbarium. 



