42 

 RUGEL'S PLANTAIN. 



{Planlago Rugelii.) 



The seeds arc dark brown to black, varying in length from 

 1.25 — 2.5 m.m. They are slightly flattened with sharp angles, 



D / * '^ 



Figure 38 

 Fig. 38. Rugel's Plantain. 



and vary in shape from oval oblong to rhomboidal. The surface 

 of the seed is minutely roughened and dull, but with no ridge or 

 lines as in P. major. The cotyledons have the ventral and dorsal 

 position in the seed. The epidermal layer consists of rectangu- 

 lar cells arranged in rows, which, however, are not continuous 

 or parallel as in P. major. This seed greatly resembles P. major 

 but is slightly larger. (Fig. 3S.) 



GREEN FOXTAIL. 



{Chat'tochloa viriiUs, L.) 



YELLOW FOXTAIL. 



(Chaetochloa glauca, L.) 



The seeds of these two varieties are different in size, although 

 both have the same general appearance. The seeds of both 

 are fiat on the palet side and very convex on the other. In size 

 they vary from 2 — 3 m.m. in length and from 1.5 — 2 m.m. in 

 width. The seeds of the yellow foxtail are usually somewhat 

 larger and less convex than those of the green, and the color o^ 

 the ripe fruit is somewhat different. Glauca is greenish yellow 

 in color, while viridis is from pale green to light brown in color. 



The histological characteristics of the foxtails are almost 

 identical and it is extremely difficult to separate the two varie- 

 ties when they occur in ground condition. 



