GENUS PINUS. 79 



tree, and I have known a specimen that was planted under 

 exceptionally favourable conditions to attain the height of 43 

 feet in twenty years.^ 



PINUS (Linn^us). 

 THE PINES. 



Flowers monoecious ; males in catkins ; females solitary and 

 terminal. 



Cones woody, conical in shape, usually ripening in the 

 second year. 



Scales persistent and imbricated. 



Seeds with a hard, bony covering, oval in shape, and 

 usually furnished with an ample wing, or wingless. 



Cotyledons entire, variable in number. 



Leaves in tufts, persistent, and in sheaths of two, three, or 

 five in number, seldom only one. 



Evergreen trees or shrubs, with the leaves in tufts of two, 

 three, or five. 



Pin US albicaulis, Engelmann. {Synonyms: P.flexilis, 

 Murray ; P, cembroides^ Newberry ; P. Shasta ^ Carri^re ; P. 

 flexilis albicaulisy Engelmann.) Coast ranges of British 

 Columbia, Sub-Alpine belts of the Rocky Mountains and 

 Sierras. In a young state this is a neat-growing tree of 

 rather pronounced conical outline, with the lower branches 

 horizontal and the upper ascending. The appearance of the 

 foliage is like that of P. cembra, being in colour a dark rather 

 sombre green, each leaf fully 2 inches long, but in this as well 

 as size of cone .it varies to a wide extent. Usually the cones 

 are 4 inches long, but I have seen other specimens from old 

 and stunted trees that were not half that length. It is of no 

 particular value for ornamental planting in this country, the 



1 In a letter received from the Hon. Mark RoUe, P. sitchensis, P. morinda, and 

 several other species have, judging from the measurements given, done well, and 

 attained to large size at Bicton, in Devonshire, 



