THE PINES OF MEXICO. 25 



14. PINUS PRIXGLEI Shaw. 



Pinus Pringj^ei Shaw, Sargent Trees & Shrubs, i, 211, t. 100 (1905.) 



Leaves with persistent sheaths, in fascicles of 3, 15-25 cm. long, stout, serrate; resin ducts 

 internal ; hypoderm bundles projecting far into and occasionally across the green tissue. Cone- 

 lets subterminal, long-pedunculate, single or in pairs, the prickle of the scales very small and 

 deciduous. Cones renexed, on short stout rigid peduncles, 5-10 cm. long, conical, pendent 

 or patulous, persistent, their apophyses tumid or somewhat pyramidal, lustrous ochre-yel- 

 low, those at the base of the cone often prominent and slightly rerlexed ; seed-wing conspicu- 

 ously thickened at the base. Branchlets sometimes pruinose ; the decurrent bases of the bracts 

 deciduous. Bark for a few years scaly and red. 



A tree of the subtropical zone, with bright green, long, stout leaves, persistent, often abun- 

 dant cones and long sinuous branches ; associated with P. oocarpa and/ 5 . Laiusoni. Its geo- 

 graphical limits are not now definitely determined. 



Nelson, 2182 (398570) Chilpancingo, Guerrero. Pringle, 10019, Uruapan, Michoacan. Shaw, Uruapan and 

 Huingo, Michoacan; Cuernavaca, Morelos. 



Pinus Pringlei flowers in November or in early December, earlier than its associate and near relative P. oocarpa. 

 I have seen it at Uruapan, at Huingo on Lake Cuisco, and near Cuernavaca at the base of the northern slope of 

 the Ajusco Mountains. In the last station a tree was found bearing several fascicles of two leaves, an exceptional 

 number for a Hard Pine exclusively Mexican. From my limited observations it appears that the species 

 is quite constant in its long stout leaves, but the cones vary much in size on different trees. 



PLATE XVIII. 



Fig. 1. Cone from Uruapan. Fig. 5. Seeds. 



" 2. Leaves and conelets. " 6, 7. Cones from Uruapan. 



" 3. Leaf-section, magn. 30 diam. " 8. Cone of Nelson 2182. 



" 4. Conelet magnified. 



