368 A HANDBOOK OF CONIFERS 



Leaves 2-3 in. long. Buds cylindric or spindle-shaped. 



Young shoots shining brown. Buds f in. long. Leaves 



rigid, very sharp -pointed, basal sheath J in. long. — P. 



pungens. 

 Young shoots slender, glaucous. Buds | in. long. Basal 



sheath |-^ in. long. — P. virginiana. 

 Leaves about 1 in. long. Buds cylindrical. 



Young shoots slender, greenish. Buds ovoid, | in. long. 



Basal sheath |-| in. long. — P. Banksiana. 

 Leaves 3-6 in. long. Buds cylindrical, ovoid, often sharply 



pointed. 

 Young shoots orange brown. Buds pale brown, |^-| in. 



long. Resin canals in leaves marginal, basal sheath 



less than 1 in. long. — P. resinosa. 

 Young shoots brown. Buds |-1 in. long, brown tinged 



with white. Basal sheath I in. long. — P. Laricio. 

 Young shoots glaucous. Buds |-1 in. long, dark brown. 



Leaves rigid. Basal sheath | in. long. — P. leuco- 



dermis. 

 Young shoots brown. Buds |-f in. long, white. Leaves 



rigid. Basal sheath | in. long, ending above in two 



long filaments. — P. Thunbergi. 

 Young shoots light brown. Buds ^f in. long, brown. 



Basal sheath \ in. long. Leaves occasionally in 



twos and threes on the same branch. — P. sinensis. 

 Winter buds white with resin, points of the bud scales appressed. 

 Young shoots brown. Buds \ in. long. Leaves twisted, 



up to 3| in. long, basal sheath \ in. long. — P. con- 



torta. 

 Young shoots brown. Buds \-\ in. long. Leaves \\-2 



in. long, basal sheath |-J in. long. — P. montana. 



Pinus albicaulis, Engelmann. 

 White -BABK Pine, 



Pinus cembroides, Newberry (not Zuccarini) ; P. flexilis, Balfour (not 

 James) ; P. flexilis, var. albicaulis, Engelmann ; P. Shasta, Cari-iere. Alpine 

 Pine ; Alpine White-bark Pine ; Creeping Pine ; Pitch Pine ; White- 

 stem Pine. 



A sub-alpine species, usually shrubby or prostrate in habit, 

 but occasionally of tree-like dimensions 50 ft. high, and 4-6 ft. 

 in girth of bole, with a contorted trunk and twisted branch 

 system. Bark of young trees whitish and smooth, on old trees 

 thin and scaling in small patches. Young shoots reddish brown, 

 with scattered minute hairs or sometimes without down. Winter 

 buds broadly ovate, sharp-pointed, with loosely overlapping, long, 

 acuminate scales. Leaves in fives, similar to those of P. flexilis. 

 Cones sub-terminal, sessile, spreading, ovoid, l|-3 in. long, dark 



