THE GENERAL CHARACTERS OF SEEDS 



427 



margins entire, each with tubercle on the back ; color brown ; 

 achene triangular, elliptical, with pointed apex ; one-twelfth to one- 

 eighth in. in length ; color brown ; surface smooth, shining ; mar- 

 gins minutely roughened. 



Tall Dock {Rumex altissimus Wood). 



Usually but one wing of fruiting calyx bearing tubercle ; pedicel 

 as long as wings; perianth segments veined; margins nearly en- 

 tire; achene triangular, widened at the base; one-sixteenth to one- 

 twelfth in. in length ; scar prominent. 



Pig. 261A 



Figure 261B 



8> £> 



«a b 



Figure 2610 



Figure 261D 



Fig. 261. A and B, Tall Dock (Rumex altissimus). C and D, Broad-leaved 



Dock (Rumex obtusif olius) . C, tubercle and calyx. 

 (A, drawn by L. R. Collins; B and C, drawn by Ada Hayden ; D, after Hill- 

 man, Bull. Nev. Agr. Exp. Sta.) 



Broad-leaved Dock {Rumex obtusif olius L.). 



Wings of the fruit small, only 1-tubercled; margins of wings 

 deeply toothed, backs rugose ; fruit three-sixteenths in. long ; 

 achenes convex between angles, one-twelfth to one-eighth in. in 

 length; conspicuous scar at base. 



