THE GENERAL CHARACTERS OP SEEDS 



427 



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

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

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

 gins minutely roughened. 



Tall Dock {Eumex altissinms Wood). 



Usually but one wing of fruiting calyx bearing tubercle ; pedicel 

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

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

 twelfth in. in length; soar prominent. 



Fig. 261A 



Figure 261B 



6 e> 



Figure 26".0 



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



Dock (Bumex obtusifoUus). 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 obtusifolius L.). 



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

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

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

 length; conspicuous scar at base. 



