THE GENERAL CHARACTERS OF SEEDS 



449 



Figure 302A 



Figure TO2B 



Fig. 302. A. Cinquefoil (Potentilla canadensis). B, Five-finger (Potentilla mon- 

 speliensis var. norvegica). A, two seeds (achenes), side view. B. a seed 

 in edge view. C, group showing the natural size. 



(After Hillman ; A, Bull. Mich. Agr. Exp. Sta. ; B, Bull. Nev. Agr. Exp. Sta.) 



Five Finger {Potentilla monspeliensis L. var. norvegica (L.) 



Rydb.). 



Achenes small, ovate or kidney-shaped, one-twenty-fourth in. i» 

 length, prominently ridged; the ridges simple or branched, starting 

 from base of seed ; color light brown or straw-colored. Frequently 

 occurs in alsike clover and timothy, as well as in red clover. 



Avens (Geiim canadense Jacq.). 



Achene pale greenish brown, length 3 mm., width l 1 /-} mm., gen- 

 eral shape ovate, tapering to base, rounded at apex which bears 

 persistent hooked style 5 mm. in length tipped with a hook ; achene 

 slightly flattened, with a narrow ring along each edge. 



Figure 303A 

 Fig. 30 3. 



29 



Figure 303B 



A, Avens (Geum canadense). B, Rose {Rosa pratincola). 

 (Drawings by C. M. King.) 



