298 PINACEAE 



PINUS — continued 



trees. Cone 5 X3, unequal-sided, bright brown, boss of scale diamond- 

 shaped with minute prickle in centre. California. (Fig. 46 l.) 



P. palustris. Southern Pitch Pine. 120. E. Bark light brown, peeling in 

 thin scales; branches ascending, with Is. in tufts at end; buds whitish, 

 not resinous. Ls, 16, dark green. Cone 8x2, each scale with a short 

 hook. South-east United States. 



P. ponderosa. Western Yellow Pine. 200. E. Crown narrow, open and 

 tufted; lower branches drooping; branchlets shining reddish brown; 

 buds resinous. Ls. 12, 3-sided, densely crowded at end of branch on 

 older trees. Cone 6x2, narrowly egg-shaped, scale with short hooked 

 prickle. West North America. (Fig. 46 F.) 

 Variety Jeffreyi [P. Jeffreyi). Buds not resinous. Ls. 8, bluish. 



P. rigida. Northern Pitch Pine. 80. E. Trunk with numerous small shoots 

 in addition to the larger branches. Branchlets pale brown, hairless ; buds 

 cylindrical, resinous. Ls. 4, rough-edged. Cone i to 3, round or conical, 

 scales end in short prickle. East North America. (Fig. 46 c.) 



P. Sabiniana. Digger Pine. 50. E. Young branchlets blue-white, with Is. 

 clustered at end. Ls. 12, bluish green, drooping. Cone 10x6, very 

 resinous, scales hooked. California. 



P. Taeda. Loblolly Pine. 120. E. Bark bright reddish brown, thick; 

 branches speading or ascending; buds resinous. Ls. 9, bright green. 

 Cone 4X2, each scale with short hooked spine. East United States. 



{c) Five Is. in each bundle 



P. aristata. Bristle-cone Pine, Hickory Pine. 50. E. Often a prostrate shrub. 

 Branchlets light orange, hairless. Ls. i|, dark green, with conspicuous 

 white lines. Cone 3x2, egg-shaped, scales with hooked bristles. Cali- 

 fornia. (Fig. 46 D.) 



P. Armandii. 60. E. Branchlets greyish green. Ls. 6, bright green, minutely 

 toothed. Cone 8 X 3, narrowly egg-shaped, seeds wingless. China. 



P. Cemhra. Arolla Pine, Cembran Pine. 100. E. Densely branched and very 

 leafy. Branchlets covered with shaggy reddish brown hairs. Ls. 3, 

 bright green, smooth-edged, crowded. Cone 3x2, egg-shaped, not 

 spiny. Alps. (Fig. 46 K.) 



P. excelsa. Bhutan Pine, Blue Pine. 150. E. Bark smooth and silver-grey on | 

 young tree. Branchlets glaucous green, hairless. Ls. 6, thin, drooping, 

 bluish green, rough-edged. Cone 8 x 1 1, hanging, slightly curved. | 

 Himalaya. (Fig. 46 H.) 



P. flexilis. Limber Pine. 60. E. Branchlets long, slender and downy, can be 

 bent double without breaking. Ls. 3, rigid, dark green. Cone 4Xi|. 

 Rocky Mountains. (Fig. 46 G.) i 



P. Lambertiana. Sugar Pine. 200. E. Bark smooth, ashy grey, full of resin. 

 Buds J, blunt-ended. Ls. 4, bluish green, rough-edged, spirally twisted, 

 white lines on back, clustered at end of branch. Cone 20x3, hanging. 

 West North America. (Fig. 46 M.) 



P. monticola. Western White Pine. 125. E. Branchlets downy. Ls. 4, rigid, 

 blunt, twisted, white on one side, rough-edged. Cone 8x1, curved 

 towards tip. West North America. 



