THE GENERAL CHARACTERS OF SEEDS 443 



Shepherd's Purse {Capsella bursa-pastoris (L.) Medic). 



Seed small, flattened, oblong, with 2 longitudinal grooves; one- 

 twenty-fourth to one-twentieth in. in length ; color light brown ; scar 

 whitish, funicle prominent. In alsike clover. 





c 



aiD 



',i 



Fig. 290. Shepherd's Purse (Capsella bursa-pastoris). A, seeds showing var- 

 ious forms and degrees of color. B, showing the mucilage while wet. C, 

 a seed showing the appearance of the dried mucilage. D, a seed in cross 

 section. E, seeds, natural size. 



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



False Flax (Camelina sativa (L.) Crantz). 



Seeds one-twelfth in. in length, light brown, minutely pitted; 

 caulicle prominent, running lengthwise with conspicuous groove 



Fig. 291. False Flax (Camelina sativa). A, various forms of seeds. B, a seed 



showing the mucilage. C, a seed in cross section. D, seeds, natural size. 



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



between it and the cotyledons which are incumbent. On addition 

 of water the seeds become mucilaginous. In seeds of clovers and 

 grasses. 



