FMULLER 



Fig. 34. — Branch of Russian thistle, showing appearance before flowering and 

 before the spiny bi-anchlets have elongated ; o, spines, enlarged ; h, young grain with 

 the covering removed, enlarged about seven times ; c, blossom removed from the axil 

 and viewed from below, enlarged about four times ; d, section of fruiting calyx, side 

 view; e, same, seen from above. (U. S. Dept. of Agriculture.) 



