8 14 The Trees of Great Britain and Ireland 



PSEUDOTSUGA DOUGLASII, Douglas Fir 



Pseudotsuga Douglasii, Carriere, Conif. 256 (1867); Mayr, Fremdldnd. Wald- u. Parkbdumc, 396 



(1906). 

 Pseudotsuga Lindleyana, Carriere, Rev. Hort. 1868, p. 152, fig. 

 Pseudotsuga taxifolia^ Britton, Trans. N. York Acad. Sc. viii. 74 (1889); Sargent, Pot. Gazette, 



xliv. 226 (1907). 

 Pseudotsuga mucronata, Sudworth, Contrib. U.S. Nat. Herb. iii. 266 (1895); Sargent, Silva N. 



Amer. xii. 87, t. 607 (1898), and Trees N. Amer. 53 (1905). 

 Pseudotsuga glaucesccns, Bailly, Rev. Hort. 1895, p. 88, fig.; Andre, Rev. Hort. 1895, p. 159; 



Bellair, Rev. Hort. 1903, p. 208, f. 85. 

 Pseudotsuga glauca, Mayr. Mitt. Deut. Dendr. Ges. 1902, p. 86, and Fremdldnd. Wald-u. Parkbdume, 



404 (1906). 

 Pinus taxifolia, Lambert, Pinus, i. 51, t 33 (1803) (not Salisbury). 

 Pinus Douglasii, D. Don, in Lambert, Pinus, iii. t. (1837). 

 Abies taxi/olia, Poiret, in Lamarck, Diet. vi. 523 (1804). 

 Abies mucronata, Rafinesque, Atlant. Journ. 120 (1832). 



Abies Douglasii, Lindley, Penny Cycl. i. 32 (1833); Loudon, Arb. et Prut. Brit. iv. 2319 (1838). 

 Picea Douglasii, Link, Linncea, xv. 524 (1841). 

 Tsuga Douglasii, Carriere, Conif. 192 (1855). 

 Tsuga Lindleyana, Roezl, Cat. Conif. Mex. 8 (1857). 

 Tsuga taxifolia, Kuntze, Rev. Gen. PI. ii. 802 (1891). 

 Abietia Douglasii, Kent, Veitch's Man. Conif. 476 (1900). 



A tree, attaining in the moist climate of the Pacific coast 250 to 300 feet in 

 height and 40 feet in girth ; but in the dry regions of the interior and at high 

 altitudes rarely more than 100 feet high and 10 feet in girth. Bark of young stems 

 thin, smooth, shining, grey ; on older trunks, 2 to 1 2 inches in thickness, corky, 

 divided by deep longitudinal furrows into broad oblong scaly ridges. Young 

 branchlets usually pubescent, occasionally glabrous. Buds \ to f inch long. Leaves 

 \ to \\ inch long, straight, rounded or obtuse, rarely acute at the apex ; variable in 

 colour, the stomatic bands beneath either dull grey or conspicuously white. 



Cones, 2 to \\ inches long ; scales thin, slightly concave, rounded or slightly 

 prolonged at the apex, about f inch wide ; pubescent on both surfaces ; before 

 ripening bluish below, purple towards the apex and bright red on the closely 

 appressed margins, the bracts being pale green ; scales and bracts brown when ripe. 

 Bracts variable in length ; the three-pointed apex always, however, extending beyond 

 the scale, usually appressed, but occasionally reflexed. Seeds, about \ inch long, 

 reddish brown and shining above, paler and with whitish spots below ; wings longer 

 than the body of the seed, dark brown, rounded at the apex. 



Varieties 



1. Var. glauca, Beissner, Nadelholzkunde 419 (189 1), Colorado Douglas fir. 



In the interior of the continent, the Douglas fir, growing in a dry climate at 



1 According to the rules of botanical nomenclature adopted by the Vienna Congress of 1905, P. taxifolia is the correct 

 name for the species, as pointed out by Sargent, in Bot. Gaz. xliv. 226 (1907) ; but we prefer to use P. Douglasii, the 

 name which is universally in use amongst foresters and arboriculturists. 



