310 TORCH PINE: SCOTS PINE 



Pinus Tceda, L. Torch Pine. A North American 

 Pine with very bright green foliage. Leaf trigonal in 

 section, roucronate, minutely serratulate, 10 15 (16 

 20) cm. long, persisting 2 3 years. Grass-green beneath, 

 and with 8 10 or more white stomatal lines on the 

 flat faces. Dying leaves yellow. Basal sheath about 

 3 cm., usually torn. Resin-canals in centre of meso- 

 phyll. 



Venation simple. Vascular bundle double. 



-f -=- Needles 2 in each fascicle, semi- 

 terete, the flattened faces opposed. 

 Sheath persistent. 



8 Needles short, about 5 7 cm. 



Pinus sylvestris, L. Scots Pine (Fig. 119). Tree with 

 orange or sienna-coloured bark. Leaf 4 7 (rarely up to 

 10) cm., persisting 3 4 years ; rigid, straight, or curved 

 and twisted, slightly spreading, bluish or glaucous when 

 young, then dark green on the convex, and glaucous on 

 the plane side. Slightly rough at the angles ; apex callous, 

 acute or even pungent. Sheath of fascicle wrinkled 

 and blackish, 1 cm. long, of numerous minute scales, 

 persistent; the remains of similar scale-leaves along the 

 older twigs. Very resinous. Resin-canals numerous, all 

 round the leaf, each encircled by sclerenchyma. 



Venation simple. Vascular bundle double. Dying 

 leaves yellow. 



[There are numerous varieties, differing in habit, 

 colour, length of leaves and cones, &c. 



Allied to this is P. montana, the Mountain Pine, a 

 more or less prostrate alpine species with thick and 

 rigid needles, 2 5 up to 6 8 cm. long, deep green both 

 sides, often falcate, blunt, in crowded tufts and persisting 

 45 years.] 



