134 PINES 



Pinus Strohus, L. Weymouth Pine. Young branches 

 and twigs witli deep olive or slate-coloured smooth surface, 

 passing to wrinkled and fissured bark. Young shoots 

 destitute of leaf-spurs at base. Leaves bright green, with 

 bluish white lines down the sides. Sheath-scales (perulae) 

 soon falling. Leaf-scar a shallow circular rim. 



P. excelsa and P. monticola are very similar and hardly 

 to be distinguished by the buds, which are cylindroid, with 

 pale brown deciduous scales; the leaves more drooping and 

 lax in the former. 



(b) Buds not resinous. Young shoots with rusty 

 hairs, and the sheathing scales (perulae) brown 

 and deciduous, ciUate with whitish hairs; needles 

 short and erect, stiff; cones short, ovoid, erect. 



P. Cemhra, L. Arolla or Swiss Pine. The rusty hairy 

 shoots very characteristic and clothed throughout with 

 leaf-spurs. Buds rounded-acuminate, with long brownish 

 red scales. Leaves stiffly tufted, with bluish white lines 

 down the sides. Leaf-scar a shallow circular rim. 



(2) Needles not more than 3 in a tuft; basal 

 sheaths persistent. Buds long-pointed and 

 covered with resin. 



(a) Needles 3 in each tuft, 



P. Taeda, L. Loblolly Pine. Young branches and 

 stems grey or yellowish grey, smooth, becoming deeply 

 furrowed and resinous as they age. Leaves stiff and 

 vivid green. The brown sheaths of perute often slit. 



(b) Needles 2 in each tuft. 



(i) Needles short and bluish green. Buds 

 pale chestnut-brown, covered with whitish 

 resin, rather blunt and aggregated in threes 

 or fours beneath the terminal one. 



