54 CONTRIBUTIONS FROM THE NATIONAL, HERBARIUM. 



Mountains of Baja California, at low elevations. Southern California ; type 

 from mountains east of San Diego. 



Tree, sometimes 12 meters hi.nh, with a trunk 45 em. in diameter, the lower 

 branches often touching the ground ; bark dark reddish brown, shallowly 

 fissured ; leaves 3.5 to 4.5 cm. long, pale green ; cones 4 to 6 cm. long, brown 

 and shining; seeds about 1.5 cm. long; wood soft, close-grained, yellow or pale 

 brown, its specific gravity about 0.57. " Pin6n " (California). 



The seeds are eaten like those of the other nut pines. 



5. Pinus pinceana Gord. ; Gord. & Glend. Pinet. 204. 1858. 

 Piniis latisquama Engelm. Gard. Chron II. 18: 712. 1882. 



Coahuila to Hidalgo; type said to have come from Cuernavaca, but if so it 

 was probably taken from a cultivated tree. 



Low tree with short trunk, the branchlets long, slender, pendent ; leaves 12 to 

 16 cm. long, grayish green ; cones 6 to 9 cm. long, pendent, early deciduous. 



In the original description the tree is said to reach a height of 18 meters, 

 but it is usually much lower. 



6. Pinus nelsoni* Shaw, Gard. Chron. IIL 36: 122. f. J,9. 1904. 



Nuevo Leon, on lower slopes of the mountains ; type from Miquihuana. 



Low tree, 8 to 10 meters high, with long slender branches, these clothing the 

 trunk to the ground ; leaves 6 to 9 cm. long, grayish green. 



Shaw reports that the nuts are eaten greedily by macaws, and are sometimes 

 found in the markets for human food. 



7. Pinus ayacahuite K. Ehrenb. Linnaea 12: 492. 1838. 



Pinus stroMfortnis Engelm. in Wisliz. Mem. North, Mex. 102. 1848. 



Pinus veitchii Roezl, Cat. Conif. Mex. 32. 1857. 



Pinus honapartea Roezl, Gard. Chron.' 1858: 358. 1858. 



Pinus loudoniana Gord. ; Gord. & Glend. Pinet. 230. 1858. 



Chihuahua to Mexico, Guerrero, and Chiapas; type from Omitlfjn, Hidalgo. 

 Gua,temala» \ 



Large tree; leaves 10 to 20 cm. long; cones 20 to 45 cm. long, pendent, pale 

 yellowish or reddish brown, usually dull ; seeds with a large wing, or this rarely 

 almost obsolete. "Acanita " (Coahuila) ; " acalocahuite " (Veracruz, Ramirez) ; 

 "ayacahuite" (Valley of Mexico, Oaxaca, etc.); "ocote bianco" (Oax- 

 aca) ; "ayacahuite Colorado" (Hidalgo. Mexico, Rmnirez) \ " sacalacahuite " 

 (various localities, Ramirez) ; " pino real" (Oaxaca, Reko) ; " pino acahuitcr" 

 or "pino cahuite " (Durango, Patoni). 



8. Pinus flexilis James in Long, Exped. 2: 34. 1823. 



Mountains of Coahuila. Northward along the Rocky Mountains to Alberta; 

 type from the Rocky Mountains. 



Tree, sometimes 15 meters high, with a trunk 1.5 meters thick, the crown 

 conic or in age rounded ; bark dark brown or nearly black, deeply fissured into 

 broad ridges and scaly plates; leaves about 5 cm. long (rarely 9 cm.) ; cones 

 7.5 to 25 cm. long, light brown, with thin scales; seeds 8 to 12 mm. long, 

 winged ; wood soft, close-grained, pale yellow or reddish, its specific gravity 

 about 0.43. 



The wood of the limber pine is used to some extent in the United States for 

 construction purposes. The seeds are edible. 



'Named for E. W. Nelson (1855-), Chief of the Bureau of Biological Sur- 

 vey, U. S. Department of Agriculture. Mr. Nelson has traveled very exten- 

 sively in Mexico, while engaged in investigations of the biological features of 

 the country. He has obtained a very large series of botanical specimens, 

 which are in the U. S. National Herbarium. 



