Bailey ac Bailey: Woody Plants of National Parks 111 



Fig. 48. Pacific mountain ash {Sorbiis sitchemis) . 



Yellowstone Lake and valley below 'ake; Gibbon River; Fiiehole River; Mammoth 

 Hot Springs. GRAND TETON : near mouth of Granite Canyon, 6,700 feet. ROCKY MOUN- 

 TAIN : Bear Lake; Prospect Canyon; Cub Creek. 



4. Arizona Mountain Ash (Sorbus dumosa Greene). — Shnab with 

 clustered, slender, erect stems 5 to 9 feet high; bark reddish; winter buds and 

 young twigs densely-hairy; leaflets 9 to 11, small, % to I1/2 inches long, nar- 

 rowly-oblong, pointed at the tips, sharply-toothed almost to base, dark green 

 and somewhat glossy above, pale below; flower clusters 1 to 1^2 inches across, 

 round topped; fruits red, glossy. 



Occurrence. — grand CANVON, on the North Rim; Point Imperial; gully at edge of 

 Walhalla Plateau. 



Wild Rose {Rosa L.) 



The wild rose is among the most easily recognized of the wild shrubs with 

 the lovely pink or rose-color blossoms and, later in the summer, its conspicu- 

 ous red fruits popularly called rose hips. Most of the species are more or 

 less thorny or prickly, but some are practically thomless. In a few of the 



