THE GENERAL CHARACTERS OF SEED'S 475 



Ribgrass, BuckhorB {Plantago lanceolata It.). 



Seeds oblong, convex on back, one-twelfth to one-seventh in. in 

 length, edges folded inwardly to deep central longitudinal groove 



Fig. 344. Buckhom (.Plantaffo lanceolata). A and B, group of seeds showine 

 both the convex and grooved faces. C, a sterile seed. D, a seed In cross 

 section. E, seed showing the mucilage. P, the natural size. 

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



on inner face; brown, smooth, shining; scar at center of groove 

 frequently of dark color. 



Dooryard Plantain {Plantago major L.). 



Seeds oblong to trapezoidal in shape, usually 4-sided, some of 

 them 3-sided, one-twenty-second to one-sixteenth in. long; brown- 

 ish to black ; surface bearing 5 ridges radiating from scar ; scar on 

 middle of inner face, often with white markings. 



Eugel's Plantain (PloMtago rugelii Dene.). 



Seeds oblong, rhomboidal, generally trapezoidal with flattened 

 edges, one-eighteenth to one-twelfth in. in length ; color brownish to 

 black ; surface minutely roughened, ridgelike markings absent ; scar 

 circular, whitish. 



