THE TRUE PINES. 187 



PiNUS SYLVESTRis ARGENTEA, Stevens, the Silvery Scotch Fh*. 

 Syn. Pinus sylvestris hamata, Stevens. 

 This diflfers from the other varieties in having its cones and 

 leaves of a beautiful silvery hue. It is from the mountain 

 chain east of the Black Sea, where it attains to a great size. 



NEW OE, DOUBTFUL KIND, having the leaves two 

 IN a sheath, and of which nothing more is known. 



No. 21. Pinus Arabica, Sieber, the Arabian Pine. 



A very doubtful kind, of which little is known, beyond that 

 it is said to have its leaves in twos, loosely spreading, slender, 

 and very smooth, with the edges of the older ones almost fringed. 



It is said to have been found growing in Palestine and Arabia, 

 by Sieber, an old botanical collector, and most probably nothing 

 more than Pinus Halepensis. 



Section II. TERNAT^, or those kinds having three 



LEAVES IN each SHEATH. 



No. 22. Pinus Australis, Michaiix, the Southern Pine. 

 Syn. Pinus palustris. Miller. 

 5, „ Americana palustris, Duhamel, 

 „ „ Georgica, Hort. 



Leaves, in threes, very long, collected in bundles at the ex- 

 tremities of the branches, eight or nine inches long, with those on 

 young plants frequently a foot long ; of a brilliant green, rather 

 stout, and reflexed, when full grown. Sheaths from one and a 

 half to two inches long when young, but afterwards lacerated at 

 the ends, and much shorter on the old leaves. Branches few, 

 very robust, and irregularly placed on the trunk. Buds, very 

 large, imbricated, and free from resinous matter. Cones, very 

 long, cylindrical, tapering to a blunt point; seven or eight 

 inches long, and two inches and a half broad, and of a rich 



