308 DEODAR : AROLLA PINE 



In C. Deodara, the habit is more slender and pyra- 

 midal, with pendulous leaders and upper shoots, the leaves 

 longer, bluntly triangular or rounded, and of a brighter 

 green, and the cones longer.] 



Fascicles of needles slender, and con- 

 taining not more than 2 5 acicular 

 leaves; shoots resinous. Evergreen. 

 Mesophyll-cells with involute foldings 

 of the walls : endodermis well defined. 



Jf Needles 5 in each fascicle : trigonal 

 in section, rounded beneath. 



4- Needles short and rigid, 6 12 up 

 to 10 15 cm. long : scales of the 

 fascicle {dwarf shoot) caducous. 

 Cones erect, ovoid, obtuse, 7 10 

 cm. long. 



Pinus Gembra, L. Arolla Pine. Alpine Pine with 

 irregular form. Leaves rigid, strong, erect or hardly 

 spreading, 5 8 cm., 6 12 cm. or up to 10 15 cm. long, 

 hardly pointed, glaucous and keeled above with white 

 stomatal lines ; green and rounded beneath : edges harsh 

 with minute serratulre towards the tip, and somewhat 

 broader below. Sheath short or long and caducous, 

 reddish. Leaves persisting 4 5 years. Dying leaves 

 yellow. Shoots pubescent. Cones ovoid, 7 10 cm., 

 obtuse. Resin-canals 3, all round the leaf. Venation 

 simple. Vascular bundle single. 



-f- -I- Needles long and slender, 10 20 

 cm. or more. Cones pendent, 

 cylindric- tapering, 15 25 cm. 

 long. 



Pinus Strobus, L. Weymouth Pine. Tall tree. Leaves 

 slender, triquetal, 10 or 12 (6 12) cm. long; acute, bluish 



