CATALOGUE OF CANADIAN PLANTS. 467 



and stunted. Where sheltered or growing in dense groves, it assumes 

 much the habit of the next species. On the Queen Charlotte Islands 

 it was scarcely seen, except on the western coast, and was not observed 

 near the water-level on the lower Skeena. (Dawson.*) 



(2079.) P. Murray ana, Balfour. Black Pine. 



P. contorta, Macoun's Cat. No. 1679, in part. 



P. contorta, var. latifolia, Dawson in Canadian Nat., new ser., IX., 328. 



P. inops, Hook. Fl. II. , 161, in part. 



P. - Sp. L, Bourg. in Palliser's Report, 260. 



On the east side of the Rocky Mountains, this species was first noticed 

 in the alpine woods between the Athabasca River and Lesser Slave 

 Lake; thence south ward it is found on the gravelly slopes of the moun- 

 tains and foot-hills, at an altitude of about 4,000 feet. Fine groves are 

 found at the western end of the Cypress Hills, but they never descend 

 more than 500 feet below the summit. On the line of the Canadian 

 Pacific Railway it is abundant, both in the Bow valley and on the 

 mountain sides, amongst gravel, especially at Silver City, and west- 

 ward to Laggan. In the Columbia valley it covers wide areas of poor 

 soil at Donald, and is seen on all the lower slopes of the mountains on 

 the east side of the river. (Macoun.) This is the characteristic tree 

 over the northern part of the interior plateau of British Columbia, and 

 densely covers great areas. In the southern part of the province it is 

 found abundantly on parts of the plateau and hills which rise above 

 the height of 3,500 feet, where the rainfall becomes too great for the 

 healthy growth of P. ponderosa. It grows also abundantly on the sandy 

 benches and river-flats at less elevations. Dall states the northern limit 

 of this tree to be on the Youcon, at Fort Selkirk, Latitude 62. In the 

 Peace River region it crosses the Rocky Mountain range, and occurs, 

 more or less abundantly, over a great area, generally on the higher 

 plateaux with poor soil. It is replaced by the Banksian pine at the 

 water-shed between the Athabasca and Saskatchewan, south of Atha- 

 basca Landing. Abundant southward in the Rocky Mountains to the 

 49th parallel, and extending into the adjacent foothills. In the interior 

 of British Columbia it often forms dense groves, the trees being 60 to 

 even 100 feet in height, but seldom exceeding a diameter of two feet. 

 It does not extend upward to the timber limit in the Rocky Mountains. 

 Found also in the Sweet Grass Hills. (Dawson.} 



(2080.) P. rigida, Miller. Pitch Pine. 



Yalley of the St. John River, New Brunswick, to the northern shores 

 of Lake Ontario. (Sargent.} I have never seen this tree in any part 

 of Ontario, except on the Thousand Islands, in the St. Lawrence, near 

 Alexandria Bay. (Macoun.~) 

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