24 THE PINES OF MEXICO. 



18. PINUS PONDEROSA DOUGL. 



Pinus poxderosa Douglas ex Lawson & Son Agric. Man. 354 (1836). Loudon, Arb. 

 et Frut. Brit, iv, 2243, fig. 2133 (1838). Encycl. Trees & S/irubs, 981, fig. 1831 

 (1842); Forbes. Pinet. Woburn. 44, t. 15 (1839). Antoine, Die Conif. 28, t. 8, fig. 1 

 (1840). Sargent, Gard. & For. i. 392, fig. 62 (1888); Silva N. Am. xi, 77, t. 560 and 561 

 (1897); Man. Trees N. Am. 15, fig. 15 (1905). Britton.iV. Am. Trees, 24, fig. 18 (1908). 

 Sudworth, Forest Trees Pad/. Slope, 42, fig. 13 (1908). 



Pinus brachyptera Engelmann, Wislizemis Tour Nor. Mex. 89 {Senate Doc. 1848). 

 Leaves stout, in fascicles of 2-5, their numerous resin ducts medial. Cones 6-19 cm. long, 



early deciduous, the peduncle and a few basal scales usually temporarily persistent on the tree 



after the fall of the cone ; apophyses armed with usually stout and persistent prickles. 



Northern Mexico and from western Texas and the eastern slope of the southern Rocky 



Mountains to the Pacific Ocean. 



Nelson, 4568 (398622) El Salto, Durango; 6055 (398626) Sierra Madre, Chihuahua. Shaw, Sandia, Durango. 



PlNUS PONDEROSA VAR. MACROPHYLLA N. VAR. 



Pinus MACROPHYLI.A Engelmann, Wislizemis 1 Tour Nor. Mex. 103 (Senate Doc. 1848), not 

 Lindley. 



Pinus Engelmanni Carriere, Rev. Hort. 227 ( 1854). 



Leaves stout, 30-40 cm. long, in fascicles of 3-5 ; cones large, their apophyses prolonged 

 into a more or less reflexed protuberance armed with a stout or Weak prickle. 



Sierras of north western Mexico. 



Goldman, 163 (396790) Guasarachi, Chihuahua; 290 (396792) Alamos, Sonora. Pringle, 1448, Chihuahua. 



Pinus ponderosa var. Jeffreyi Vasey, Rep. Dept. Agric. U. S., 179(1 875). Sargent, 

 Silva N. Am. xi, 79, t. 562 and 563 (1897); Man. Trees N Am. 16, fig. 16 (1905). 

 Pinus Jeffreyi A. Murray, Oreg. Comm. 2, fig. (1853). Lawson, Pinet. Brit, i, 45, fig. 

 (1884). Sudworth, Forest Trees Pacif. Slope, 47, fig. 14 (1908). 



Pinus deflexa Torrey, Emory s Rep. Mex. Bound, ii, pt. 1, 209, t. 56 (1859). A. Murray,. 

 Gard. Chron. ser. 2, iv, 295, fig. 65 (1875). 



Cones large, their scales armed with slender or stout reflexed prickles; branchlets pruinose. 

 Northern California Baja, and on the Mountains of California. 

 Goldman, 1245 (565150) San Pedro Martir Mts., California Baja. 



Pinus ponderosa var. arizonica n. var. 



Pinus arizonica Engelmann, Rothrock Wheelers Rep. vi, 260 (1878). Sargent, Silva N. 



Am. xi, 75 t. 559 (1897); Man. Trees N. Am. 14, fig 14 (1905). Britton, N. Am. Trees,. 



22, fig. 16 (1908). 



Leaves in fascicles of 3-5; cones small; branchlets pruinose. 



On the north eastern and north western Sierras, and mountains of southern Arizona. 



Nelson, 4502 (398616) Miquihuana, Nuevo Leon. 



PLATE XVII. 



Fig. 1 . Cone of P. ponderosa. Fig. 4. Cone of var. arizonica. 



" 2. Cone of var. macrophylla, Goldman 163. " 5. Leaf-section " magn. 30 diam. 



'< 3. " " " " Pringle 1448. " 6. " " var. macrophylla, magn. 30 diam. 



