THE GENERAL CHARACTERS OF SEEDS 



473 





Figure 341A 



r 



' < ' - Pigure 341C 



Pis. 341. A. Moth\ Mullein (Terbascum blattaria) . A, a group of seed's, e»- 

 larged, showing different forms, and kinds of surface markings, a, b an* 

 c were produced from seeds of V. Hattaria,.a,n& d from T. tftopsu*. B rep- 

 resents a group natural size. C, a section taken lengthwise through th« 

 center of a seed, showing the embryo and surrounding endosperm. 



B. Commo(i Mullein (.Terbascum thapsus). 



C. Toad Flax (Linaria vulgaris). A, a side view of a seed niuch enlarged, the 

 scar within the notch on the upper right-hand margin. B, a group show- 

 ing the natural size. C, a section through the center of a seed showing 

 the embryo. 



(A, after Hillman, Bull. Mich. Agr. Exp. Sta. ; B, drawing by L. R. Collins ; 



C, after Hillman, Bull. Mich. Agr. Exp. Sta.) 



Toad-flax {Lmaria vulgaris Hill.). 



Seeds flattened, wiiigrma^giiied, orbicular in outline, wing wavy, 

 notched at one end; one-twelfth in. in diameter; surface rugose; 

 wings one-thirtieth to one-twenty-flfth in. wide; embryo slender, 

 curved. Commonly occurs in grass seed and occasionally in clover. 



Speedwell {Veronica peregrinaJj.). 



Seeds oblong to egg-shaped, flattened, one-thirty-second to one- 

 thirtieth in. long, slightly curved, the outer face with a central 

 ridge; embryo straight, surrounded by the endosperm; raphe on 

 the inner face; sca,r projecting. 



