22 l I 



ARBORETUM AND FRUTICETUM. 



PART III. 



Spec. Char. s S-c Leaves three in a sheath, much longer than the cones, 

 flexible, tortuous, with short sheaths ; crest of the anthers rounded, entire. 

 Cones ovate, reflex ed, with the apices 

 of the scales flattened, with a raised 

 process in the middle, terminating in 

 a conical, minute, recurved spine, 

 I slightly quadrangular. Buds, in Dou- 

 glas's specimen, 2. in. long and §in. 

 f.'-'j broad; cylindrical, with straight sides, 

 11' rounded like a dome at the extremity, 

 V but with a prominent blunt point ; dark 

 \ . /' brown, and covered with resin. Buds, 

 - • - on the living tree in the Horticultural 



' . Society's Garden (see Jig. 2132.), from 



lin. to liin. long, and from fin. to 

 H in. broad; smooth, cylindrical, with along point; 

 reddish brown, and covered with a fine white bloom, 

 consisting of fine particles of resin, surrounded by 

 two or more smaller buds. Leaves disposed in pa- 

 rallel spirals ; in Douglas's specimen (see j£g. 2133.), 

 from 9 in. to 1 1 in. long ; 3 in a sheath, which is from 

 ^ in. to 1 in. in length, with numerous fine rings ; 

 scales of the leaves persistent on the wood, even of 

 two years' or three years' growth. Leaves, on the 

 living plant, from 7 in. to 9 in. long. The cone (see 

 Jig. 2134.), in Douglas's specimen, is deformed, and 



very imperfectly 

 developed ; it is 

 only 3 in. long, and 

 fin. broad. The 

 scales are termi- 

 nated in flattened 

 processes, scarcely 

 ribbed in any direc- 

 tion. In the centre 

 of the process is a 

 protuberance, large 

 in proportion to 



the scale, which terminates in a sharp 



prickle, pointing outwards. Scale I in. 



long, and fin. broad; dark brown. Seed 



T 5 ^-in. long, and fin. broad; dark brown, 



with the wing nearly 1 in. in length, and 



£in. in breadth; wings of a yellowish 



brown. The following description, given 



in Lawson's Manual, of a young tree of 



P. ponderosa, taken from the specimen 



growing in the Caledonian Horticultural 



•Society'sGarden, which, in 1837, was 15 ft. 



high, is at once correct and character- 



istir : — " In its habit of growth, P. pon- 



seerns to surpass all others of the genus for strength and luxuriance. 



The branches are few, regularly verticillated, horizontal, and seem inclined to 



a-.-.ume a pendulous or drooping habit as the tree becomes old ; central or top 



shoot often more than an inch in diameter, and of proportionable length. 



liud- large, and free from resin. Leaves thickly set, 9 in. to 1 ft. or 1 ft. 2 in. 



in length ; thick, rind, and nearly straight ; rounded on the exterior, and 



a longitudinal prominent rib, together with minute channels, on the in- 



