58 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



23. Pinus oocarpa Schiede, Linnaea 12: 491. 1838. 



Sinaloa to Zacatecas and Chiapas; type collected between Ario and VolcSn 

 de JoruUo, Michoacan. Guatemala. 



Tree, 12 to 15 meters high, with round compact head and stout branches; 

 leaves 18 to 28 cm. long, bright green ; cones 4 to 8 or sometimes 10 cm. long, 

 persistent, pendent or spreading, ocher-yellow, often tinged with gray or green. 

 "Ocote" (Oaxaca) ; " pino real" (Tepic) ; said to be known also as " ocote 

 macho." 



T^'mus oocarpa microphylla Shaw* is a form from Sinaloa and Tepee with 

 leaves only 8 to 13 cm. long. 



24. Pinus greggii' Engelm. ; Pari, in DC. Prodr. 16': 396. 1868. 

 Mountains of Coahuila ; type collected near Saltillo. 



Tree, 10 to 15 meters high, with smooth gray bark when young ; leaves bright 

 green, erect ; cones reflexed, ocher-yellow, lustrous. 

 25 Pinus patula Schlecht. & Cham. Linnaea 6: 354. 1831. 



Quer^taro to Veracruz and Puebla ; type collected between Lerma and Toluca, 

 Mexico. 



Tree, 12 to 25 meters high, with long slender branches, the upper part of 

 the trunk red ; leaves 15 to 30 cm. long, slender, drooping ; cones 6 to 9 cm. 

 long, reflexed, persistent, dark browm. 

 26. Pinus contorta Dougl. ; Loud. Arb. Frut. 4: 2292. 1830. 



San Pedro Martir Mountains of Baja California, at an altitude of about 2,400 

 meters. Northward to Alaska. 



In the Mexican locality 22 to 30 meters high or larger, with straight trunk 

 and narrow tapering crown ; bark very thin, smooth, orange-brown ; leaves 

 3 to 8 cm. long, stiff, yellowish green; cones 5 to 6 cm. long, ocher-brown, 

 lustrous ; wood soft, weak, close-grained, light yellow or whitish, with little 

 resin, its specific gravity about 0.41. 



2. PSEUDOTSUGA Carr. Trait. Conif. ed. 2. 256. 1867. 



References : Britton, N. Amer. Trees 69-73. f. 55, 56. 1908 ; Sudworth, For. 

 Trees Pacif. Slope 99-106. f. S6, 37. 1908. 



Trees with linear leaves 2 to 3 cm. long; cones ovoid-oblong, drooping, the 

 bracts lobed, exserted beyond the rounded cone scales. 



Cones 5 to 10 cm. long; bracts of the cones much exserted 1. P. mucronata. 



Cones 10 to 17 cm. long ; bracts only slightly exserted 2. P. macrocarpa. 



1. Pseudotsuga mucronata (Raf.) Sudw. Contr. U. S. Nat. Herb. 3: 266. 1895. 



Abies mucronata Raf. Atl. Journ. 120. 1832. 



Abies douglasii Lindl. Penny Cycl. 1: 32. 1833. 



Pseudotsuga douglasii Carr. Trait. Conif. ed. 2. 256. 1867. 



Mountains, at high altitudes, Chihuahua and Sonora to Hidalgo. Northward 

 to southern Canada ; type f i-om the mouth of the Columbia River. 



* Pines Mex. 27. 1909. 



* Little is known concerning Josiah Gregg, who was a trader under the 

 patronage of Thomas G. Rockhill, a Philadelphia merchant. He published in 

 1844 " The Commerce of the Prairies," in which he tells of his travels in the 

 West, and of his residence of nearly nine years in northern Mexico. He made 

 botanical collections in Mexico, and his specimens are chiefly in the herbarium 

 of the Missouri Botanical Garden. He is believed to have died in California 

 in 18.50. The genus Oreggia, of the family Brassicaceae, was named in his 

 honor by Gray. 



