PINACE^ 453 



Pinus Strobus, Linnscus. (Fig. 88.) 

 White Pine or Weymouth Pine. 



Pinus alba, var. canadensis, Provancher ; P. canadensis, var. quinque- 

 folia, Du Hamel ; P. tenuifolia, Salisbury ; P. tabula? formis, Hort. ; P. 

 umbraculifera, Hort. : Strobus Strobus, Small. Apple Pine ; New Eng- 

 land Pine ; Northern Pine ; Pumpkin Pine ; Quebec Pine ; Sapling 

 Pine ; Soft Pine ; Tonawanda Pine ; Yellow Pine. 



A tree attaining in America a height of 80-150 ft. with a 

 tapering trunk 9-12 ft. in girth, the branches of old trees forming 

 a round-topped or pjrramidal crown with the leaves in horizontal 

 masses. Bark thin and smooth on young trees, becoming rugged 

 and fissured about the lower parts of old specimens, and 1-2 in. 

 thick. Young shoots slender with tufts of short hairs below the 

 insertion of the leaf bundles, usually without down elsewhere.^ 

 Winter buds conic, with a sharp point, | in. long, resinous, with 

 some of the scales free at the tips. Leaves in fives, persisting 2-3 

 years, slender, bluish green, 3-5 in. long, margins finely toothed, 

 white stomatic lines on the two inner surfaces ; resin canals 

 marginal ; basal sheath about f in. long, soon falling away. Cones 

 sub-terminal, pendulous, cylindrical, often curved and pointed 

 at the apex, 4-6 in. long, 1 in. in diameter before opening, resinous, 

 on stalks up to 1 in. long ; scales thin, smooth, the exposed 

 portion light brown when mature, rounded at the apex. Seed 

 ovoid, I in. long, reddish brown, mottled with black, wing narrow, 

 1 in. long. 



The following horticultural varieties are sometimes met 

 with : — 



Var. aurea. 

 Leaves yellowish when young. 



Var. monophylla, Tubeuf. 



Leaves cohering more or less throughout their length and 

 forming a single leaf. 



Var. nana, Knight. 



A dwarf variety of compact, shrubby habit, rarely exceeding 

 6 ft. in height. Branches short, slender ; branchlets crowded. 

 Leaves short, f-l| in. long. The varieties described as compacta, 

 densa and umbraculifera are of similar habit. It is one of the best 

 of dwarf conifers for planting in rock gardens. 



Var. nivea, Booth and Knight, 

 Leaves short and silvery-white beneath. 



^ The pubescence is occasionally spread over the whole surface of the branch- 

 let, thus approaching the character of P. monticola, but it is denser below the 

 insertion of the leaves. 



