536 A HANDBOOK OF CONIFERS 



and not pointing forwards, about | in. long, and ^ in. or less 

 broad, margins usually finely but obscurely toothed in the upper 

 half ; upper surface flattened, distinctly grooved almost to the 

 rounded apex, lower surface with lines of stomata the whole 

 length of the leaf, upper surface with a few broken lines of 

 stomata near the apex. 



According to A. Murray^ this hemlock was raised at Edin- 

 burgh 2 in 1851 from seeds collected on the Mount Baker range 

 in British Columbia by Jeffrey, but the dried specimens received 

 subsequently from him are the ordinary grey-leaved form of 

 T. Pattoniana. Tsuga Jeffreyi was only known as a cultivated 

 tree until a few years ago, when a young plant identical with it 

 was discovered by Mr. M. Hornibrook among some seedhng 

 conifers which had been dug up when a few inches high in the 

 mountains behind Cowchan Lake, Vancouver, and sent to him 

 for cultivation at Knapton, Queen's County, Ireland. 



T. Jeffreyi appears to occupy a position midway between 

 T. Albertiana and T. Pattoniana, and the latest view expressed 

 by Henry ^ is that it is a hybrid between these species. This 

 view is supported by the fact that both the assumed parents are 

 found growing together on Mount Baker range, and in Vancouver. 



There are small trees of this hemlock, evidently of considerable 

 age, at Kew, Woburn and Westonbirt, and younger plants else- 

 where. It will perhaps prove to be not uncommon when looked 

 for, having probably been passed over as a green-leaved form of 

 P. Pattoniana. 



This plant is of no economic importance. In cultivation it 

 may be treated as other hemlocks. 



McNab, Proceedings of the Royal Irish Academy, ii, 209 (1875); Journal of 

 the LinncBan Society, xix, 208 (1882). 



Tsuga Pattoniana, Seneclauze. 

 Mountain Hemlock. 



Tsuga Hookeriana, Carriere ; Abies Pattoniana, Jeffrey ; A. William- 

 soni, Newberry ; Hesperopeuke Pattoniana, Lemmon ; Pinus Pattoniana, 

 Parlatore. Alpine Hemlock ; Patton's Hemlock ; Weeping Spruce. 



A tree occurring at high elevations in W. N. America, where 

 it occasionally attains a height of 150 ft. with a girth of 15 ft., 

 its average height being below 100 ft. Bark dark reddish brown, 

 scaly, very thick and roughly corrugated in old trees. Young 

 shoots brownish grey, densely hairy. Branchlets unequal in 

 length, the shorter ones arising on the upper side of the longer, 

 forming a tufted spray of foliage. Leaves closely set, spreading 



'^Proceedings Horticultural Society, ii, 202 (1863). 



^ The original tree in the Edinburgh Botanic Garden is dead, but a seedling, 

 now about four feet high, has since appeared as a casual along with a species of 

 Rhododendron sent from the Selkirks. 



^ " Notes on Hybrid Conifers " {Proceedings of the Royal Irish Academy, 

 September, 1919, p. 56). 



