190S.] 



TREES AXD SHEUBS. 



527 



usually solitary reddish berr3^ which has a delightful flavor, ripens 

 in July or August. 



J. B. Tyrrell collected this species on Carey Lake, and J. W. Tyr- 

 rell found it on Hanbury River in 1900. 



Rubus strigosus Michaux. Red Raspberry. 



The wild red raspberry is an abundant shrub nearly throughout 

 the forested region. It attains its greatest perfection in the south- 

 ern 23art of this area, along the Athabaska and Slave rivers, where it 

 forms dense thickets, particularly in the burned areas, and bears pro- 

 fusely. Along the canoe route between Great Slave and Great Bear 

 lakes it is common, but does not attain its normal size, though it bears 

 good fruit as far north as Great Bear Lake. On Lake St. Croix its 

 berries were just ripening on August l-t. 1903. On the Mackenzie it 

 was not noted north of Fort Good Hope, but probably extends far- 

 ther. In phices where the i^lant is common, as along the Athabaska, 

 its fruit forms a favorite food of the black bear. 



The Tyrrell brothers collected it on the north shore of Care}' Lake, 

 in 1898. 



Dasiphora fruticosa (Linn.) Rydberg. Shrubby Cinquefoil. 



This is an abundant shrub throughout the region north to the limit 

 of the forest. Through the region south of Great Slave Lake its con- 

 >picuous yellow flowers appear early in June, and continue blooming 

 for a]K)ut two months. It was in full flower along the canoe route 

 north of Fort Rae during August. 1908. and at Leith Point, at the end 

 of August, a few blossoms still persisted on the stems. Here, and gen- 

 erally along the northern border of its range, the plant occurs in a 

 somewhat dwarfed state. It is common along the Mackenzie, and was 

 observed just leaving out near the mouth of Xahanni River on June 

 -t. 1904, and was in flower at Fort Good Hope on June 21. Mr. E. S. 

 Jones gave me a specimen in flower which he gathered on Richards 

 Island, near the mouth of the Mackenzie, late in June. 



The i^lant Avas collected by the Tyrrell brothers on the north shore 

 of Athabaska Lake near Fond du Lac. 



Dryas integrifolia Vahl. Entire-leaved Avens. 



This herbaceous shrub is common through the Barren Grounds, 

 and along the extreme upper edge of the timbered country, and is 

 thus one of the species most characteristic of the Arctic zone. I first 

 noted it on the southern shore of Great Bear Lake near Leith Point, 

 where it was abundant. Along the Mackenzie I took flowering speci- 

 mens on the summit of the Xahanni ]\Iountains on June 4, 1904, but 

 at the river level first detected it near Fort Good Hope, where it was 

 in flower on June 23 (PL XXV. fig. 1). G. A. Ball gave me speci- 



