12 THE PINES OK MEXICO. 



5. PINUS FLEXILIS JAMES. 



Pinus fl.kxil.is James, Longs Exped. ii, 34 (1823). Nuttall, N. Am. Sylva, iii, 107, t. 112 

 (1849). Parlatore, DC. Prodr, xvi, pt. 2, 403 (1868). Hemsley, Bot. Biol. Cent. Am. iii,. 

 187 (1883). Lawson, Pinet. Brit, i, 33, fig. (1884). Sargent, Silva N. Am. xi, 35, t. 546 & 

 547 (1897); Man. Trees N. Am. 7, fig. 5 (1905). Britton, N. Am. Trees, 11, fig. 6 (1908)- 

 Sudworth, Forest Trees Pad/. Slope, 27, figs. 5, 6 (1908). 



Leaves in fascicles of 5 not exceeding 8 or 9 cm. in length, entire, their stomata dorsal and 

 ventral. Cones 10-25 cm. long, their scales straight or reflexed and of varying thickness ; 

 seed wings short and ineffective. 



In a limited- area of northern Mexico, and common along the Rocky Mountains as far north 

 as southern Alberta. 



Nelson, 6136 (347362) General Cepeda, Coahuila. 



PiXUs flkxilis var. kkflkxa Engelmann, Rothrock Wheelers Rep. vi, 258 (1878). 

 Pinus reflexa Engelmann, Bot. Gaz. vii,4 C1882). Mayr, Fremdl. Wald. Eur. 388 (1906). 

 Pinus strobikormis Sudworth, Bull. No. \\,Div. Forestry U. S. Dep. Agric. 17 (not En- 

 gelmann), (1897). Sargent, Silva N. Am. xi, 33, t. 544 & 545 (1897); Man. Trees N. Am. 

 6, fig. 4 (1905). Britton, N. Am. Trees, 11, fig. 5 (1908). 



Pinus ayacahuite var. strobikormis Lemmon, Cone-Bearing Trees Pacif. Slope, 4 (1892). 

 Cone scales often thin, reflexed. Leaves entire or serrulate with or without dorsal stomata. 



There are no specimens of this form in the Nelson & Rose collections. Mr. Pringle found it in northern 

 Chihuahua in 1887. The variety is intermediate between P. flexilis and P. ayacahuite, but all the cones that I 

 have seen resemble those of P. flexilis in size and in general appearance. 



6. PINUS LAMBERTIANA DOUGL. 



Pinus Lambertiana Douglas, Trans. Linn. Soc.xv, 500 (1827). Lambert, Gen. Pin. ed. 

 3- 1. 57- t- 34 ( l &3 2 )'< e d- i> iii , text and plate (1837). Loudon, Arb. et Frut. Brit. 2288,. 

 fig. 2205 (1838); Encycl. Trees & Shrubs, 1019, fig. 1912 (1842). Forbes, Pinet. Woburn. 

 j-j, t. 30 (1839). Antoine, Die Conif. 41, t. 19 (1840). Parlatore, DC. Prodr. xvi, pt. 2, 

 406 (1868). Hemsley, Bot. Biol. Cent. Am. iii, 187 (1883). Lawson, Pinet. Brit, i, 47, fig. 

 (1884). Brandegee, Zoe, iv, 201 (1894). Sargent, Silva N. Am. xi, 27, t. 542 & 543 

 (iSgy);Man. Trees N. Am. 5, fig. 3 (1905). Britton, N. Am. 7rees, 9, fig. 4 (1908). Sud- 

 worth, Forest Trees Pacif. Slope, 23, figs. 3, 4 (1908). 



Leaves in fascicles of 5, not exceeding 10 cm. in length, their stomata dorsal and ventral. 

 Cones 25-45 cm. long, their scales straight and thick; seeds large, with rather short broad 

 wings. 



Western United States from southern Oregon to southern California, occurring in Mexico 

 at one station only, where it was first discovered by Mr. Brandegee. 



Goldman, 1219 (565125) San Pedro Martir Mts. California Baja. 



