OF THE GENUS PINs. 573 
( Resin-canals marginal. Leaves 6-9 cent. 
23, Gerardiana. 
J Resin-canals median. J.eaves 4-7 cent. 
24. chihuahuana. 
Resin-canals internal or median ? (imperfectly known). 
25, Lumholtzii. 
-——__. 
XX. 
r— 
B. Bud-scales tightly imbricate, subcoriaceous. T.eaf- 
sheaths persistent ; scales convolute, membranous. 
* Leaves 3-5, 3-sided. 
Sect. 5. Inpicm®. Spp. 26-28. 
Cone ovate-conic, 6-7 cent. Resin-canals marginal; meristele 
XXI. elliptic in section ; fibro-vascular bundle simple. 
26. insularis. 
Fibro-vascular bundle branched .............00. XXII. 
Cone ovate-conic, 10-12 cent. esin-canals marginal ; 
meristele elliptic .............5 27. longifolia. 
Cone ovoid, 4-6 cent, Resin-canals marginal; meristele 
XXII. 
triangular... ... eee ee eee eee eee 28. Khasya. 
Sect. 6. Ponprnos%. Spp. 29-40. 
ye Cones subterminal, usually large ...........4-. XXIV. 
XXII. | Cones lateral. ......... cece eee eeee Sete ee eee XXY. 
¢ Cones oblong-cylindric ; apophysis prominent, 4—5-sided ; 
umbo straight ...........0.06- 29, canariensis. 
Cones cylindric-conic; umbo recurved. Bark generally 
AXTV.< pale ; endoderm-cells 50-60 .... 80, ponderosa. 
Cones broadly ovoid. Bark purplish black; endoderm- 
cells 40 ...... eee e eee 51. ponderesa, var. Jeffreyi. 
XXVI. 
XXIX, 
Y 
XXVv Cones mostly large, 10-25 cent. long .......-.. 
““"* {Cones of medium size, less than 12 cent. long... 
Cones clustered, subsessile, persistent in many whoris along 
XXVI the branches. (See also 64, muricata.) 32. attenuata. 
— (tuberculata.) 
Cones solitary, in pairs or in single whorls...... XXVIIL. 
33. radiata. 
(insignis. ) 
XXVIII. 
( Cones large, oblique, especially at the base. 
XXVII. 
Cones large, symmetrical,....-.. sec eeeees 
(Tips of the cone-seales passing abruptly into a stout, 
much-curved umbo; leaves dense, green, ascending or 
34, Coulteri. 
XXVHUIL- spreading re er sere ; 
“ ) Tips of the cone-scales passing gradually into a stout 
subulate umbo; leaves thin, bluish, pendulous. 
35, Sabiniana. 
