THE PINES OF MEXICO. 



1. PINUS CEMBROIDES Zucc. 



PiNUS cembroides Zuccarini, Abhand. Akad. Wiss. Muench. i. 392 (1832). Endlicher, Syn. 

 Conif. 182 (1847). Parlatore, DC. Prodr. xvi, pt. 2, 397(1868). Hemsley, Bot.Biol. Cent. 

 Am. iii, 186(1883). Sargent, Gard. & For. iv, 352, fig. 59 (1891); Silva N. Am. xi, 47, t. 



550 ( 1897); Man. Trees N. Am. 10, fig. 10(1905). Britton, N. Am. Trees, 14, fig. 8 (1908). 



PiNU.sLLAVEANASchiede, Zz'rt^,xii, 488 (1838). Forbes, .AW/. Woburn. ^g,t. 17 (1839). 

 Antoine, Die Conif: 36, t. 16, fig. 1 (1840). Loudon, Encycl. Trees and Shrubs, 993, fig. 

 1858-1860 (1842). 



Pinus osteosperma Engelmann, Wislizenus' Tour Nor. Mex. 89 {Senate Doc. 1848). 



Leaves with deciduous sheaths, in fascicles of 3 or of 1-5, rarely exceeding 4 or 5 cm. in 

 length, entire ; stomata dorsal and ventral ; resin ducts external. Conelets on short peduncles, 

 subterminal, single or in clusters of 2-5, their scales tumid, transversely keeled, each armed 

 with a minute dorsal prickle. Cones not exceeding 5-6 cm. in length, subsessile or on short 

 peduncles, symmetrical, globose or short-ovate, opening at maturity, early deciduous; their 

 scales few, those at the base and apex sterile, much smaller than the few large central fertile 

 scales ; apophyses lustrous, pale ochre or reddish-orange, pyramidal, or protuberant and 

 slightly reflexed, the umbo central. Seeds wingless, of a flaxen color when fresh. Branchlets 

 slender, pale brown, more or less pruinose, the cortex persistently smooth for several years. 

 Buds pale brown or gray-yellow, small, cylindrical, free from gum. 



A low broad round-headed tree with a short trunk, growing on dry slopes and table-lands 

 from the 20th degree of north latitude to Colorado and Utah. 



Nelson, 4498, (398613) Miquihuana, Nuevo Leon; 6143 (347369) General Cepeda, Coahuila; 4556 (398619) 

 El Salto, Durango ; 6079 (398627) Sierra Madre, Chihuahua Nelson & Goldman, 7457 (565528) La Laguna, 

 California Baja. Rose, Painter 6 Rose, 9093 (452573)Sierra de la Mesa, Hidalgo Pringle, 2659, 4018, Carneros, 

 Coahuila Palmer, 82, 773, State of Durango Hartman, 367, State of Sonora Brandegee, Laguna, California 

 Baja Shaw, San Lorenzo, Nuevo Leon; Sandia, Durango. 



PiNUS CEMBROIDES var. MONOPHYLLA Voss. Mitt. Deutsch. Dendr. Gesell. xvi, 95 (1907). 



Pinus monophylla Torrey, Fremont's Rep. 319, t. 4 (1845). Parlatore, DC. Prodr. xvi, pt. 

 2, 378 (1868). Lawson, Pinet. Brit, i, 65, fig. (1884). Sargent, Silva N. Am. xi, 51, t. 



55 1 O897); Man. Trees N. Am. 12, fig. 12 (1905). Britton, N. Am. Trees, 16, fig. 10 

 (1908). Sudworth, Forest Trees Pacif. Slope 35, fig. 9 (1908). 



Pinus Fremontiana. Endlicher, Syn. Conif. 183, (1847). 



Leaves mostly single, occasionally in pairs. . 



Northern California Baja ; common beyond the northern boundary in Utah, Arizona, Nevada 

 and southern California. 



