884 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



and Coulter, Fl. Colorado ; Hayden's Surv. Misc. Pub. No. 4, l29 J 

 Hayden in Warren's Rep. Nebraska and Dakota, ed. 2, 121 ; Vasey, .. 

 Cat. Forest Trees, 30 ; Hall in Coulter's Bot. Gaz. ii. 91 ; Macoun 

 in Geolog. Rep, Canada, 1875-76, 211 ; Brandegee in Coulter's Bot. 

 Gaz. iii. 32 ; G. M. Dawson in Canadian Nat. new ser. ix. 326 ; 

 Rusby in Bull. Torr. Bot. Club, ix. 106 ; Veitch, Man. Conif. 167 ; 

 Beissner, Nadelholzk. 260. P. Benthamiana, Hartw. Journ. Hort. 

 Soc. ii. 189, and iii. 223. P. Beardsleyi, Murr. Edin. New Phil. 

 Journ. 1855, 286. P. Craigiana, Murr. 



Habitat. — Interior of British Columbia, south of latitude 51°; south 

 and east along the mountain ranges of the Pacific region to Mexico, 

 the Black Hills of Dakota, Colorado, and Western Texas ; not detected 

 in Central or Southern Nevada. 



P. ponderosa, Douglas, is a variable and widespread species of 

 western North America, several forms of which have been described 

 as distinct. 



A large tree, 200-300 feet in height, with a trunk 12-15 feet in 

 diameter, or throughout the Rocky Mountain region much smaller, 

 rarely exceeding 100 feet in height (var. scopulorum) ; dry, rocky 

 ridges and prairies, or in Northern California, rarely in cold, wet 

 swamps, reaching its greatest development along the western slope of 

 the sierras of Northern and Central California ; in Western Washington 

 Territory and Oregon rare and local ; after Paeudotsuga Dunglasii the 

 most generally distributed and valuable timber tree of the Pacific 

 forests, furnishing the principal lumber of Eastern Washington 

 Territory and Oregon, Western Montana, Idaho, the Black Hills of 

 Dakota, Western Texas, New Mexico, ai^d Arizona. 



Wood, varying greatly in quality and value, heavy, hard, strong, 

 brittle, not coarse-grained nor durable, compact ; bands of small 

 summer cells broad or narrow, very resinous, conspicuous, resin 

 passages few, small ; medullary rays numerous, obscure ; colour light 

 red, the very thick sapwood almost white ; specific gravity, 0'4715 ; 

 ash, 0*35 ; largely manufactured into lumber, and used for railway 

 ties, fuel, &c. (C. S. Sargent, "Forest Trees of North America"). 



It has done well in Sweden at Alnarp and at Gothenburg, and 

 seems to be hardy in Denmark. 



P. p. var. scopulorum, Engelm. in Fl. Calif, ii. 125. P. 

 po7iderosa, by botanists from the Rocky Mountains. 



Habitat. — According to Engelmann, it is to be found on the whole 

 of the Rocky Mountains. 



Seems to be hardy. 



P. pseudostrobus, Lindl. Bot. Reg. 1839, 63 ; Loud. Encycl. 

 of Trees, 1008, f . 1888 ; Spach, Hist. Veg. Phan. xi. 402 ; Endl. Syn. 

 Conif. 156 ; Lindl. and Gord. Journ. Hort. Soc. v. 216 ; Carr. Man. 

 des PI. iv. 350, and Tr. Gen. Conif. 321 ; Gord. Pinet. 237 ; Henk. 

 andHochst. Syn. der Nadelh. 104 (excl. syn.). 



