35 



ROUGH PIGWEED. 



{Amaranthiis sp.?) 



There are several species of this seed found in feed stuffs and 

 as their characteristics are practically the same they will not be 

 differentiated in this work. Thev are all glossv l^lack in color, 



Figure 28 

 Fig. 28. Rough Pigweed. Epidermal cells. 



or glossy brown, if unripe, and double convex in shape, rather 

 more so usually than the lambs-quarters. In size they are usual- 

 ly smaller than lambs-quarters, varying in the different species 

 from .5 — 1.25 m.m. in diameter. The seeds very rarely exceed 

 the latter size, and the seed envelope is seldom found adhering 

 to the seed. 



Under the microscope the surface layer of cells is seen to 

 be polygonal in shape, and ordinarily six-sided, the division 

 lines between the cells being very distinct when the layers are 

 cleared with potash or Javelle water or chloral hydrate. The 

 surface of the cells is covered thickly with very minute projec- 

 tions, much smaller than those of the lambs-quarters, giving a 

 dotted appearance to the surface. (Fig. 28.) 



PIGWEED, LAMBS-QUARTERS, GOOSEFOOT. 



(Chenopodium album.) 



This seed is usually found whole, and on account of its similar 



