THE PINES OF MEXICO. 



19 



11. PINUS PSEUDOSTROBUS LiNDL. 



Pixus pseudostrobus Lindley, Bot. Reg. xxv, Misc. 63 (1839) Loudon, Encycl. Trees 

 & Shrubs, 1008, fig. 1888 (1842). Endlicher, Syn. Conif. 156 (1847). Parlatore, DC. 

 Prodr. xvi, pt. 2, 401 (1868). Hemsley, Bot. Bin/. Cent. Am. iii. 189 (1883). 



Pinus orizabae Gordon, Jour. Hort. Soc. Lond. i, 237, fig. (1846). Endlicher, Syn. Conif. 

 156 (1847). 



Leaves with persistent sheaths, in fascicles of 5, 15-30 cm. long, serrate, usually slender ; 

 resin ducts medial, outer walls of the endoderm cells thick, the two fibro-vascular bundles con- 

 tiguous. Conelets subterminal, long-pedunculate, single or in clusters of 2 or 3, their scales 

 armed with a small, ultimately deciduous prickle. Cones ovate or oblong, variable in size, 7- 

 14 cm. in length, subsymmetrical or oblique, opening at maturity, early deciduous, the pe- 

 duncle and a few basal scales usually temporarily persistent on the tree, their apophyses flat, 

 or protuberant in various degrees. Branchlets slender, usually conspicuously pruinose, the 

 decurrent bases of the bracts clearly defined but not persistent, and becoming merged in the 

 smooth bark of the young trees. Buds orange-yellow, the male aments forming cylindrical 

 enlargements just above their base. 



A large tree with a trunk diameter of nearly 2 meters, of very rapid growth in youth, and 

 producing very long straight internodes, slender verticillate branches and drooping leaves. 

 Bark smooth at first, becoming very rough in old age. 



Everywhere in Mexico, where subtropical or warmer temperate conditions prevail, and 

 ranging as far south as Nicaragua. 



Nelson, 2521 (398576) Miahuatlan, Oaxaca ; 3185 (398591) San Cristobal, Chiapas; 65S8 (399175) Mt. 

 Patamban, Michoacan; 6888 (3986633-4) Mt. Tancftaro, Michoacan. Goldman, 20 (324783) Huauchinango, 

 Puebla. Pringle, 2109, Guadalajara, Jalisco; 8090, Jalapa, Vera Cruz; 8787, Eslava, Mexico. Shaw, 

 Contreras, Mexico ; Tres Marias, Morelos. 



Pin us pseudostrobus var. apulcensis, n var. 



Pinus apulcencis Lindley, Bot. Reg. xxv, Misc. 63 (1839). Loudon, Encycl. Trees & Shrubs 

 1014, fig. 1899 (1842). Endlicher, Syn. Conif. 153 (1847). 



Cone differing from that of the species by a greater or less prolongation of the apophyses. 



Growing with the type. 



Nelson, 985 (39855S) La Parada, Oaxaca; 2539 (39S5S3) Miahuatlan, Oaxaca. Pringle, S7SS, Eslava, 

 Mexico. 



The variety apulcensis is easily recognized by the peculiar development of the apophyses of the cone, which 

 may attain remarkable prominence. It is least prominent in Pringle's specimen from Eslava, where the 

 variety passes into the species ; Nelson No. 2539 is an intermediate form, while the cone of his No. 9S5 shows 

 this variation in a most marked degree. In the Mexican collection of the Paris Museum there is a beautiful 

 cone of this variety from the Cofre de Perote, Vera Cruz, collected by Hahn in 1866, with conspicuous pro- 

 tuberances on all the scales. 



PLATE XII. 



Fig. 1. Cone from Tres Marias. 

 " 2. Cone from Contreras. 

 " 3, 4. Leaf-sections, magn. 30 diam. 



" 5- 



Bud bearing male aments. 



Var. apulcensis. 

 Fig. 6. Cone of Pringle 8788. 

 " 7. Cone of Nelson 2539. 

 " 8. Cone of Nelson 985. 



