426 



-WEED FLORA OF IOWA 



<9 S) 



Sf 



Figure 259A 



Figure 259B 



F"ig. 259. A. Sour Dock (Rumex acetosa) . A, various achenes. B, diagram 



of the calyx. C, achenes and calyx, natural size. 

 B Sheep Sorrel (Rumex acetosella). A, seeds bearing the calyx segments. 

 B, one having the segments partially broken away. C, achenes from which 

 the calyx is removed. D, seeds, natural size. 



(After Hillman, Bull. Nev. Agr. Exp. Sta.) 



with blunt angles, one-twenty-fourth to one-twentieth in. in length; 

 color of fruit grayish to brownish. Common in red, white and 

 alsike clover. 



Curled Dock (Rumex crispus L.). 



Perianth frequently persistent, consisting of thin veined lobes 

 of the calyx, winged in fruit; wings cordate or notched at base; 



y s ?*- 



4 



Figure 260 



Fig. 260. Curled Dock (Rumex crispus). A, views of achenes. B, a cross- 

 sectional view of the same. C, diagram of the calyx. D, achenes and 

 calyces, natural size. E, a shrunken achene. 



(After Hillman, Bull. Nev. Agr. Exp. Sta.) 



