BOS ACE AE (ROSE FAMILY) 



207 



slightly notched at the edge, 

 ripening and falling all summer. 



Achenes smooth, very small, 

 (Fig. 149.) 



Means of control 



Enrich the soil, furnishing humus which will enable it to retain 

 moisture and support the growth of better plants. 



SHRUBBY CINQUEFOIL 

 Potentilla fruticdsa, L. 



Other English names: Yellow Hardback, Prairie Weed, Black 



Brush, Chester Flower. 

 Native. Perennial. Propagates by seeds. 

 Time of bloom : May to October. 

 Seed-time: Seeds remain on the plant until winter, being usually 



scattered between December and March. 

 Range: Labrador to Alaska, southward to New Jersey, Illinois, 



and Minnesota. In the Rocky Mountains to Arizona and in the* 



Sierra Nevadas to California. 

 Habitat : Dry open ground ; meadows and pastures. 



A plant which has shown its weedy qualities 

 chiefly in New England and in parts of 

 Colorado, Indiana, and Ohio. It is a shrub, 

 one to five feet tall, branching from the base, 

 making a spreading, compact growth which 

 chokes out all else. Young shoots are clothed 

 in white down, but when mature the stems be- 

 come hard, woody, and covered with hairy, 

 ragged, grayish brown bark. These old " Hard- 

 hack" stems are incredibly tough and turn the 

 edge of the sharpest scythes. Leaves pinnately 

 five- to seven-foliate, the leaflets pointed at both 

 ends, a half-inch to an inch long, entire, with 

 margins slightly revolute, gray-green with silky 

 hairs. Flowers in terminal cymose clusters, 

 numerous, bright yellow, about an inch broad, 

 the five petals nearly round and exceeding 

 the ovate calyx-lobes and the pointed bracts. 

 Achenes twenty or more to a flower, small, xi 



FIG. 150. Shrub- 

 by Cinquefoil (Po- 



