THE GENERAL CHARACTERS OF SEEDS 



473 



♦ 



Figure 341A 



Figure 341B 



3 



Figure 341C 



Fig. 341. A. Moth Mullein (Verbascum blattaria). A, a group of seeds, en- 

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

 c were produced from seeds of V. blattaria, and d from V. thapsus. 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. Common Mullein (.Verbascum thapsus). 



C. Toad Flax (Linaria vulgaris). A, a side view of a seed much 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 (Linaria vulgaris Hill.). 



Seeds flattened, wing-margined, orbicular in outline, wing wavy, 

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

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

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



Speedwell (Veronica peregrina L.). 



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 ; scar projecting. 



