ROSACEA. 287 



4. CERCOCAKPUS, H. B. K 



1. Cercocarpus parvifoliits, Nuit. 



Hab. Umpqua River, Southern Oregon, and Valley of the Sacra- 

 mento, California. — A shrub, sometimes attaining the height of 12 to 

 14 feet, with a stem six inches in diameter. The leaves vary from 

 narrowly cuneate-oblong to broadly obovate, and from less than an 

 inch to two and a half inches long. It includes G. betulifolius of 

 Nuttall. 



5. P U R S H I A, DC 



1. PdRSHlA TRIDENT ATA, DC, 



Hab. Interior of Washington Territory, and Oregon to the borders 

 of California; eastward to the Rocky Mountains, but rare beyond 

 long. 108°. The most southern station known to us is derived from 

 the collections and notes of Col. Fremont. He found the plant on 

 the eastern side of the Sierra Nevada, in latitude 34° 27' and longi- 

 tude 117° 13'. 



6. GEUM, Linn. 



1. Geum macrophtllum, Willd. 



Hab. Borders of Puget Sound and eastward to Canada and high 

 mountains of New England ; common in woods. 



2. Geum (Sieversia) triflorum, Piirsh. 



Hab. Prairies near Gray's Harbor. Ravines and plains of the Nez 

 Perces country, extending eastward to Northern New York, New 

 Hampshire, &c. — A low and less villous form, with the stems scape- 

 like and only one-flowered, was found on the Upper Columbia. 



