48 GENUS PINUS 



Spring-shoots uninodal. Leaves in fascicles of S, 4 or 5, the sheath deciduous, from 8 to 14 cm. 

 long; resin-ducts medial with an occasional internal duct. Conelets single or verticillate, their 

 scales mucronate; conelets of the second year only slightly enlarged. Cones maturing the third year, 

 not exceeding 7 cm. in length, ovate or ovate-conic, subsymmetrical, more or less reflexed, persistent 

 for several years on some trees, sometimes serotinous; apophyses lighter or darker brown, often with 

 an olive or fuscous shade, thin or tumid, the umbo double, the mucro more persistent near the apex 

 of the cone. 



This species grows at subtropical or warm-temperate altitudes in Mexico, from Oaxaca through 

 the central and western states to southern Arizona and New Mexico. As it approaches the northern 

 part of its range the leaves become thicker and more rigid and the number in the fascicle is reduced 

 to 3 or 4 (var. chihuahuana, Shaw, Pines Mex. 14). Like P. rigida it sprouts freely along the 

 branches and trunk, and stumps of felled trees put out shoots in great numbers. The species is easily 

 recognized by the deciduous sheath and triennial cone. 



Plate XVI. 



Fig. 151, Branch with fruit of first, second and third years. Fig. 152, Leaf -fascicles. 

 Fig. 153, Magnified leaf-section of the spjecies. Fig. 154, Magnified leaf-section of the variety. 



21. PINUS LUMHOLTZII 



1894 P. LuMHOLTZii Robinson & Femald in Proc. Am. Acad. xxx. 122. 

 Spring-shoots uninodal, sometimes multinodal. Leaves in fascicles of 3, the sheath deciduous, 

 from 20 to 30 cm. long, absolutely pendent; resin-ducts medial and internal. Conelets subterminal, 

 or lateral and subterminal, mucronate. Cones not exceeding 7 cm. in length, symmetrical, pendent 

 on slender peduncles, ovate-conic, early deciduous; apophyses sublustrous, nut-brown, tumid at the 

 margins, flat on the surface, the umbo large, the mucro rarely persistent. 



A remarkable Pine with long pendent bright green foliage, confined to the western states of 

 Mexico and ranging on the mountains from southern Jalisco to the latitude of the city of Chihuahua. 

 Each season's growth of leaves hangs from the branchlet like a long beard, from which the tree 

 receives, in some localities, the name "Pino barba caida. " In the herbarium the long leaves, decidu- 

 ous sheaths, and the decurrent bases of the bracts, present a combination of characters not found in 

 other species. 



Plate XVI. 



Fig. 155, Cone. Fig. 156, Cone. Fig. 157, Leaf-fascicle. Fig. 158, Magnified leaf-section. 

 Fig. 159, Tree at Ferraria de Tula. 



Vin. LOXOIFOLIAE 



Seed-wing adnate to the nut. Leaves long, in fascicles of 3, the sheath persistent. 



Apophysis of the cone prolonged and reflexed 22. longifolia. 



Apophysis of the cone low-pyramidal 23. canariensis. 



22. PINUS LONGIFOLIA 



1803 P. LONGIFOLIA Roxburgh ex Lambert, Gen. Pin. i. 29, t. 21. 

 1897 P. RoxBURGHii Sargent, Silva N. Am. xi. 9. 



Spring-shoots uninodal. Leaves in fascicles of 3, the sheath persistent, from 20 to 30 cm. long; 

 resin-ducts external, the hypoderm often in large masses, some or all of the endoderm cells with thick 

 outer walls. Cones from 10 to 17 cm. long, short-pedunculate, ovoid-conic; apophyses lustrous 

 brown-ochre or fuscous brown, elevated into thick, often reflexed, beaks with obtuse mutic umbos; 

 seeds with large nuts and adnate striated dark gray or fuscous brown wings. 



