N 



xlii 



INTRODUCTION. 



many good qualities ; it is therefore of importance to distinguish their seeds, whieh are so much 

 ahke. The chief mark of distinction to the naked eye, is the woolly web which connects or 

 entangles the seeds ; in the P. pratensis it is greater than in the P. tnmahs; the seeds of the 

 former can hardly be separated from each other, but those of the P. trimah. are very little 

 entangled by the web. But with the aid of a glass, they may be determined with more cer- 

 tainty : the seed of the P. pratensis being more acuminate, and appearing on the face concave ; 

 while that of the P. trivialis is shorter, rounder, and nearly quite flat on the face. See No. XIII. 

 pro char, gener. 



